Quinoa-and-Turkey Patties in Pita with Tahini Sauce

INGREDIENTS

• 1 cup white quinoa
• 1 garlic clove
• 1/4 cup tahini
• 1/4 cup fresh lemon juice
• 12 ounces ground dark-meat turkey
• 1/4 teaspoon plus 1 pinch ground allspice
• 1/2 teaspoon plus 1 pinch ground cumin
• Pinch of crushed red-pepper flakes (optional)
• 2 tablespoons chopped fresh mint
• 2 scallions, finely chopped
• 3/4 teaspoon coarse salt
• Vegetable-oil cooking spray
• 6 lettuce leaves, torn into large pieces
• 1 English (hothouse) cucumber (10 ounces), thinly sliced into rounds
• 1 small red onion, cut into thin half-moons
• 6 pita breads