from Vegetarian Cooking for Everyone
yields about 1/2 cup
1 plump garlic clove, coarsely chopped
salt
1/3 cup tahini
juice of 1 large lemon
Pound the garlic to a paste with 1/4 teaspoon salt in a mortar, then stir it into the tahini. Begin stirring in about 1/2 cup water until the sauce is as thin as you want it, then add the lemon juice to taste. Taste for salt and add more if needed.