Rub the mixing bowl with a clove of garlic, add one-half teaspoon of salt, dash of white pepper, and a teaspoon of cold water or a bit of ice, then four tablespoons of oil. Mix until the salt is dissolved, remove the ice and add ten drops of tabasco sauce, two tablespoons tarragon vinegar, one tablespoon grated onion, one tablespoon chopped parsley and one chopped gherkin.