Chef Chris Nugent’s Sunchoke Soup With Potato, Lobster and Truffle Froth; yes, you can make it at home. (Patti Harburger)

 In the case of the sunchoke soup recipe included in Wednesday’s summer soup roundup, though, success can be obtained – right down to the truffle froth on top.

Chris Nugent, in his kitchen at Goosefoot in northern Chicago. (Patti Harburger)

The 38-year-old chef is soft-spoken and humble; his plates are meticulously and thoughtfully crafted. “I like to refer to my food as having a little flavor-forward harmony, with French tradition and respect for the farmer,” he says. Nugent must be one of the few buzzy chefs to be eschewing pork products; he and his wife agreed to keep them off the menu, in part, because of a clientele that includes the large Jewish population in nearby Skokie.

Ingredients ready to go. (Patti Harburger)

On a Sunday afternoon when the chef would have been shopping the farmers markets, he had the soup’s ingredients prepped and ready in his narrow, sparse restaurant kitchen where three cooks and an intern work in the evenings.

Sunchoke pieces and aromatics simmer in broth; below, the chef froths milk. (Patti Harburger)

Milk flavored with white truffle oil and salt froths up quickly and can hold for about 10 minutes, the chef says. (Patti Harburger)

* He places the pan of sauteed aromatics on top of the boiling sunchokes, so they steam and stay soft.

* He heats the broth before adding it to the mixture, to avoid a drop in temperature.

* If you go the richer route and add butter and truffle oil to the soup base, those ingredients can be added to the blender (in batches) as you puree.

* He steams the vegetable and seafood additions (in this recipe, a little diced, cooked potato and coin slices of poached lobster) and garnishes before adding them to the soup; sometimes he uses a little soup to warm them up in a separate bowl.

* He serves the soup in a conical bowl that’s about five inches deep, which helps keep the contents warm till the last spoonful.

About that froth: It might seem fussy for a home cook, but it’s simple to do — and as integral to this dish as the diner’s surprise of seafood and vegetable at the bottom of the bowl. Nugent flavors the milk with white truffle oil and a pinch of salt. He heats it in a saucepan to 160 degrees. A hand-held frother can create an impressive cloud of foam within a minute or two, and the froth can hold in a pan off the heat for about 10 minutes, he says. Any leftover, frothed milk can be cooled, covered and refrigerated for a day, then used to build a pasta sauce: a touch of cream, salt, pepper and Parmesan cheese, then fold in summer market vegetables.

Sunchoke Soup With Potato, Lobster and Truffle Froth

6 generous servings

Crab, poached bay scallops or shrimp can be used instead of the lobster meat.

MAKE AHEAD: The soup can be made a day in advance and reheated over low heat.

For the soup

1 pound sunchokes (see headnote)

6 tablespoons canola oil

1 large Spanish onion, cut into 1/2-inch dice (1 1/2 cups)

4 medium cloves garlic, sliced

Leaves from 2 sprigs thyme

1 medium shallot

8 cups no-salt-added chicken or vegetable broth

1/4 cup heavy cream, heated over low heat in a small saucepan

1 cup whole milk, preferably at room temperature

6 tablespoons (3/4 stick) unsalted butter, cut into pieces (optional)

1/4 cup white truffle oil (optional)

Kosher or sea salt

Freshly ground white pepper

1/4 cup poached lobster meat, cut into 1/2-inch pieces

1 cup peeled potato, cut into 1/4-inch dice then blanched (see NOTE)

For the froth

3 cups low-fat milk (2 percent)

1 teaspoon white truffle oil

Kosher or sea salt

For the soup: Peel the sunchokes. Cut them into 1/4-inch slices, then place the slices in a bowl of cold water to prevent discoloring.

Heat the oil in a large, heavy-bottomed saucepan over medium-low heat. Add the onion and stir to coat; cook for 4 minutes, stirring occasionally, so the onions soften but do not take on any color.

Add the garlic and thyme; cook for a minute or so, then add the shallot; cook for 5 or 6 minutes, stirring occasionally, until softened. Add the broth. Drain the sunchoke slices and add them to the pan; cook (uncovered) for 20 minutes.

Add the warm cream and the milk; remove from the heat.

Place a fine-mesh strainer over a large stainless-steel bowl.

Working in batches, transfer the soup mixture to a blender, making sure to fill the blender no more than half full. Remove the center knob of the lid and place a towel over the opening (so steam can escape). Puree until smooth, each time adding some of the butter and the white truffle oil, if using. As you work, transfer the soup so that it passes through the strainer into the bowl. Season with salt and pepper to taste. Cover to keep warm.

For the froth: Combine the milk, white truffle oil and salt (to taste) in a small saucepan; heat to 160 degrees (almost bubbling at the edges). Use an immersion (stick) blender or frother to create a frothy top layer on the milk in the pan; let it rest/stabilize for 3 minutes before using it to garnish the soup.

When ready to serve, divide equal amounts of the lobster meat and potato in individual bowls. Gently pour the soup over each portion. Top with equal amounts of the froth. Serve immediately.

NOTE: To blanch the potato, boil a medium saucepan of water over high heat. Add the peeled, diced potato and cook for 3 to 5 minutes, until they begin to be translucent and become tender. Drain and cool.