Put in a bowl 1/2 teaspoonful of salt, a dash of cayenne, or 1/2 saltspoonful of paprika, and one tablespoonful of tomato catsup; add gradually, stirring constantly, 4 tablespoonfuls of olive-oil. Add-1 clove of garlic mashed to a pulp, and 1 tablespoonful of tarragon vinegar, and stir until well blended.