Roasted Pepper and Tomato Salad With Tuna and Black Olives; see recipe, below. (Deb Lindsey/For The Washington Post)

In 2014, Food & Wine called it the “new sriracha” sauce. Time named it one of 2015’s food trends. Celebrity chef Jamie Oliver has been using it in recipes for years. London’s Yotam Ottolenghi learned to make it for a 2013 episode of his BBC TV show “Mediterranean Feast.” U.S. chefs have been playing with it, too; Seattle’s Renee Erickson features it in a delightfully fiery dish of roasted carrots and fennel.

While it hasn’t yet become the next sriracha, harissa — Tunisia’s legendary chile paste and one of the world’s great condiments — deserves to be in every American pantry. Robust and with a nutty, pungent earthiness behind the heat, it gives a range of dishes a vivacious and dynamic backbone with more complexity than most other hot sauces offer.

Since I fell for harissa on my first trip to Tunisia a dozen years ago, it has become one of my kitchen staples. It goes into not only such Tunisian favorites as couscous and spicy seafood pasta , but a multitude of global dishes. A spoonful whisked into Hellmann’s mayonnaise makes a speedy and rich sauce that adds the depth of garlic, caraway and coriander to the classic Spanish dish of patatas bravas. It’s great for marinating skewers of chicken, delicious stirred into a pot of stewed lentils, and a spoonful adds a jaunty punch to scrambled eggs (particularly delicious when eaten as a vegetarian taco).

But if I have some homemade harissa on hand, or an artisanal jar from Tunisia, then I simply spoon some on a dish, give it a lacing of bold olive oil and use it as a dip for bread.

The heartland of harissa is Tunisia’s Cap Bon peninsula, which locals call terre rouge, or “red land,” not only for soil that deepens in hue in the late-afternoon light, but also for the different types of peppers that ripen and turn bright red in autumn. The capsicum peppers that reached Tunisia in the 16th century after being brought back to Spain from the New World took particularly well to the peninsula’s climate and soil. Fittingly, the country’s most famous harissa brand (and best-known export) is named for the lighthouse at its tip, Le Phare du Cap Bon.


Workers in a field on the outskirts of Al Haouaria, at the tip of Cap Bon in Tunisia. The peninsula is an important agricultural area and key producer of chile peppers used in harissa. (Jeff Koehler)
‘The one thing you can’t ignore’

Cap Bon juts off northeast Tunisia like a thumb pointing toward Sicily. From nearby Tunis, it takes four or five hours to circumnavigate. The road around the peninsula passes through commercial towns with busy weekly souks, ruins, old Roman villas, the fishing port of Kebilia — with an ancient fortress towering above it — and salt flats before ending in Nabeul on the southeast shore. Along the way, glimpses of the brilliant Mediterranean flash behind orderly rows of gnarled olive trees, vineyards and fields of melons, tomatoes and — most famous of all — peppers.

After being harvested, chile peppers are sun-dried until the long, tapering pods, some five or six inches in length, turn a rich, ruddy crimson color and take on a smooth, leathery sheen. It is a common sight to see a wire running over the patio of a home with drying chiles and long ristras of dried ones hanging from hooks. The chiles are similar in shape and color to larger New Mexico varieties.

While harissa is widely available in cans and tubes in stores and by weight in market stalls that sell olives, preserved lemons and capers, many Tunisians prepare their own.

It’s simple, I was told repeatedly on a visit this summer by people in markets, spice shops and around Nabeul, the peninsula’s spice (and pottery) capital.


A strand of dried chiles hangs outside a spice shop in Nabeul, Tunisia. Soaked in water to soften, the chiles are ground with garlic, salt and spices to make the country’s ubiquitous condiment, harissa. (Jeff Koehler)

Spicy Tunisian Seafood Pasta; see recipe link, below. (Deb Lindsey/For The Washington Post)

For harissa, the dried chiles are seeded and de-ribbed — this tones down some of the heat — and then soaked in water to soften. Tunisians used to laboriously pound them in a mortar, but today they generally use a hand-crank meat grinder. (A food processor works fine, too.) Garlic and salt are added to the paste as it gets passed a second time through the grinder. Those are the minimum additions. Classic harissa has caraway and coriander seeds stirred into it, and sometimes cumin. After being spooned into glass jars, it gets a generous covering of olive oil.

Few savory dishes in Tunisia seem complete without a spoonful or two (or more) of the spicy paste. Cooks stir it into couscous broth, fish soups and tomato sauce for pasta , add it to salads of roasted red peppers or eggplant, and spoon it onto grilled sardines and red mullet. Fricassee sandwiches sold on the street get a generous dollop, as do bowls of lablabi, the widely popular chickpea stew served over pieces of day-old bread.

And if it isn’t an ingredient, it can always be added. Rather than salt and pepper, Tunisians place a dish of harissa on the table.

Restaurants generally offer a slightly elaborated dish of it along with a basket of bread. The harissa is encircled by a moat of olive oil and topped with a few black olives and wild capers, a tongue-withering fresh chile and lovely hunk of tuna to nibble on until the meal arrives.


Chile peppers dry at a farmhouse in northern Tunisia. (Jeff Koehler)

Tins of harissa, top, and tomato concentrate for sale in a shop in Nabeul on the Cap Bon peninsula in Tunisia. (Jeff Koehler)

In Tunisia, harissa is, as Ottolenghi noted, “the one thing you can’t ignore.” It is not only iconic but also ubiquitous.

While Tunisia is the largest producer and consumer of harissa in North Africa, it is also popular in Algeria and Libya, less so in Morocco. Taking pride in their ample spice box and sophisticated blending of sweet and savory ingredients, Moroccans can be dismissive of harissa as a substitute for taste, even skill. While showing me how to hand-roll couscous grains some years ago, one women informed me that “Tunisians add harissa because of a lack of flavor and imagination.”

Sure, its boldness can dominate, even overwhelm when used in excess (especially for those unaccustomed). But harissa added with a prudent hand brings a different dimension of flavor to a dish, and it’s easy to see such comments as the rhetoric of a culinary rivalry.

Along with tubes of Tunisian brands, U.S. cooks have various options for buying harissa, including some with Moroccan roots. New York Shuk, a small artisanal harissa producer run by two Israelis — the grandmother of one was from Morocco — handcrafts five versions in small batches, from classic to fiery to one with preserved lemon. These are available online and from a couple dozen merchants, mostly in New York City. Mina, founded by a woman originally from Casablanca, Morocco, sells traditional harissa as well as a green version that uses green chiles and Moroccan cumin. And the popular Washington-area fast-casual chain Cava Mezze uses harissa in numerous dishes, including the spicy lamb sliders and the seafood orzo, while its food brand offshoot offers a “Greek spin” with stewed tomatoes added to the dried pepper and fresh garlic. Whole Foods stores on the East Coast are now carrying it. (Hint: Look for it with the hummus and dips.)


Rose Petal Harissa; see recipe, below. (Deb Lindsey/For The Washington Post)
‘It’s written into their genetic code’

At the tip of Cap Bon, a few miles outside the quiet, isolated town of Al Haouaria and reached only on foot, is the lighthouse that lends Le Phare du Cap Bon brand of harissa its name. From there, Italy is not far off; Sicily is only some 85 miles away, while the volcanic island of Pantelleria just half that distance.

There are many similarities between the cuisine on that side of the Mediterranean and Tunisia: the abundance of tomatoes, olive oil and fish, of lovely capers and lemons.

But while dishes in Tunisia appear familiar, they have their own accent. There’s whole sea bream baked with tomatoes, but also black olives, wild capers and pungent preserved lemons; cuttlefish sauteed in olive oil and garlic, yet subtly seasoned with cumin; freshly squeezed lemonade pureed with fresh mint before being strained into glasses.

The strongest, most distinct accent, though, comes from the omnipresent condiment.

“All Tunisians use harissa,” said Hugues Blin, founder of À Table delicatessen, which sells Ksar artisanal harissa, one of my favorites. “It’s written into their genetic code.”

Harissa’s domination of the Tunisian palate remains unchallenged. It hasn’t conquered American tables yet, but that might be only a matter of time.

Koehler is the author of several cookbooks plus the IACP award-winning “Darjeeling.” His next book, “Where the Wild Coffee Grows,” will be published by Bloomsbury this fall. He lives in Barcelona. He will join Wednesday’s Free Range chat at noon: live.washingtonpost.com.

Recipes:

Rose Petal Harissa

2 generous cups

This is rich-tasting and mighty spicy, so use it sparingly.

MAKE AHEAD: The dried chiles for the harissa need to soak for at least 2 hours and up to 1 day. The harissa needs to cure in the refrigerator for 1 day before serving; it can be refrigerated in an airtight container for up to 2 months.

Dried rose petals and rose water are available at Mediterranean markets.

Adapted from “A Boat, a Whale & a Walrus: Menus and Stories” by Renee Erickson with Jess Thomson (Sasquatch Books, 2014).

Ingredients

3 ounces dried guajillo chile peppers, stemmed (not seeded)

1½ ounces dried ají amarillo chile peppers (also sold as ají mirasol), stemmed (not seeded)

Boiling water

2½ tablespoons caraway seed

2 tablespoons cumin seed

1 tablespoon coriander seed

1½ teaspoons fennel seed

3 large cloves garlic, coarsely chopped

1 teaspoon dried rose petals (see headnote)

10 to 12 tablespoons lime juice (from 4 to 6 limes), or more as needed

¼ teaspoon rose water (see headnote)

¼ cup extra-virgin olive oil, plus more for storing

1 to 1½ tablespoons kosher salt, or more as needed

Steps

Combine the chile peppers in a medium pot, adding enough of the boiling water to cover them. Bring to a boil over high heat, then remove from the heat and weight the chiles with a smaller pan to ensure they’re all submerged. Allow them to sit, covered, for at least 2 hours or until they are soft. (Depending on the chiles, it might not take that long; just make sure the skins are soft.) Drain; reserve the soaking water.

Combine the caraway, cumin, coriander and fennel seeds in a large saute pan over medium heat. Cook for a few minutes, stirring frequently, until they are toasted and fragrant and some of them begin to pop. Transfer to a plate to cool.

Once the spices have cooled, transfer them to a food processor; pulse until the spices are ground almost to a powder. Add the garlic and rose petals, and pulse about 10 times to form a dry paste.

Working in two batches, and wearing gloves if you’re sensitive to spice, add half of the soaked chiles to the food processor, along with any water that comes along for the ride. Add half of the lime juice and half of the rose water; pulse until the chiles are finely chopped, stopping to scrape down the sides and top of the food processor bowl as needed. (This might take 3 or 4 minutes total, so be patient. You’re looking for the texture of small-curd cottage cheese.) If the mixture seems too thick, add some of the reserved cooking/soaking water, about 2 tablespoons at a time, until the mixture moves easily in the food processor.

Once the chiles are finely chopped, add half of the oil and half of the salt; pulse until well incorporated. Transfer to a container with a tight-fitting lid; add the remaining chiles, lime juice, rose water, oil and salt; add the processed mixture to the container.

Taste, adding some lime juice and/or salt, as needed. Cover and refrigerate for at least 1 day before using. To store long-term, scoop the harissa into pint-size jars, pour a thin layer of oil on top and refrigerate.

Nutrition | Per tablespoon: 35 calories, 0 g protein, 3 g carbohydrates, 2 g fat, 0 g saturated fat, 0 mg cholesterol, 105 mg sodium, 0 g dietary fiber, 2 g sugar

Recipe tested by Kara Elder; email questions to food@washpost.com

Spicy Tunisian Seafood Pasta

Roasted Pepper and Tomato Salad With Tuna and Black Olives

More from Food:

Have questions about cooking? Join our live chat Wednesdays at noon.