Excerpts from a memorandum: "Never mix dairy food with meat . . . No eel can be served . . . Breakfast - they like to have all sorts of cheese, herrings, tomatoes, olives, fruit juices, yogurt, eggs, coffee, tea and all kinds of cakes."

Sanjay Varma, food and beverage manager of the Mena House Oberoi Hotel, is preparing his staff for a group of people they have never served and never expected to - Israelis.

Informed last week that the historic hotel at the foot of the great pyramids had been selected as the site for the preminary peace talks between Egypt and Israel, Varma rummaged frantically through libraries and consulted visiting Jewish journalists trying to learn about Jewish dietary laws and Israeli eating habits.

He says he set aside the new kitchen of an addition to the hotel and its unused dishes and utensils for the preparation and serving of kosher food. He even found the only kosher butcher in Egypt and brought him here from Alexandria.

After all that, Varma was overruled by the hotel's general manager, Homi Waddai, who decided that preparation of kosher food was "just too much for people not used to it." He has arranged with Austrian Airlines to fly in kosher meals already prepared by its kosher kitchen in Vienna.

It was not just the prospect of delegation from Israel that kept Varma busy last week.

"With all the correspondents coming in, we had to double the stock in all our bars," he said with a straight face.

It is not clear whether it is the Israeli delegation or the visiting press that the Mena House managers had in mind when they decided to keep the hotel'd night club open throughout the conference, which could last more than a week.

If they tire of looking out at the pyramids, the delegates can catch the act of belly dancer Fifi Abdou and a British group called the Three Cs - for cool, calm and collected - thress young women who dance in silver boots and little else.

The Mena House first opened as a hotel in 1869, when it accommodated guest invited to Egypt for the opening of the Suez Canal. It is the richest in history of all the hotels in Egypt.

Winston Churchill, Franklin D. Roosevelt and Chiang Kai-shek met there to plan war strategy in 1943, with British troops standing watch atop the Great Pyramid Cheops across the road.

King Farouk liked to drop in for a bite after a hunt in the desert.

The Aga Khan played frequently on its golf course. Richard Nixon ate lunch there. Charlie Chaplin and Robert Taylor were guests. So were King Zog of Albania, Cecil B. DeMille and Barbara Hutton.

Despite its handsome setting among tress and gardens within a short walk of one of the world's greatest tourist attractions, the hotel fell into disrepair and disrepute under state management during the Nasser years. According to Wadai, the current manager, "even those nightclubs on the pyramids road wouldn't send their performers to stay here."

The India-based Oberoi chain took the management in 1972 and has modernized and expanded the hotel, making it again a sucess with tourists and residents who like its relatively peaceful location on the outskirts of chaotic Cairo.

The hotel will be closed to the public next week and sealed off by an army of security forces unmatched since Nixon's visit. The main dining room.the Riyaiyat Room. has been closed and is being converted into a conference hall. The Egyptian army is installing Telex and telephone lines for the hundreds of journalists who are already arriving in Cairo.

It is a measure of the euphoria here that the journalists from Israeli newspapers are receiving special treatment from the government. Not only their Israel press cards being accepted by the Egyptian Ministry of information for accreditation purposes, but they are being lodged in the best hotels, while Western correspondents scramble for third quarters.