INGREDIENTS
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2 tablespoons tahini (sesame seed paste, available at natural foods stores and some supermarkets)
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3 tablespoons fresh lemon juice
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1 large garlic clove, minced and mashed to a paste with 1/2 teaspoon salt
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1/8 teaspoon cayenne, or to taste
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1/3 cup olive oil
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four 6 1/2-ounce cans tuna packed in oil, drained and flaked
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2 pounds onions, sliced thin
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1/3 cup vegetable oil
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1/3 cup pine nuts
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1 cup chopped fresh flat-leafed parsley leaves plus parsley sprigs for garnish
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6 to 8 pita loaves, quartered and opened into pockets