3 tablespoons plain fat-free yogurt
2 tablespoons water
1 tablespoon lemon juice
1 tablespoon tahini (sesame-seed paste)
1/2 teaspoon ground cumin
1/4 teaspoon salt
2 garlic cloves, peeled
1 (15 1/2-ounce) can chickpeas (garbanzo beans), drained
12 (1-ounce) slices whole-wheat bread
2 cups shredded Bibb lettuce
8 (1/4-inch-thick) slices tomato
4 (1/4-inch-thick) slices red onion
1 cup (1/8-inch-thick) slices cucumber
4 cups alfalfa sprouts (4 ounces)