Allow seven Blue Point oysters to each person, and season with three-fourth tablespoon lemon juice, one-half tablespoon tomato catsup, one-half teaspoon finely chopped shallot, three drops Tabasco sauce, few gratings horseradish root, and salt to taste. Chill thoroughly and serve in cocktail glasses. Sprinkle with finely chopped celery and garnish with small pieces of red and green pepper.