Combine all ingredients, except the green onions, in a food processor, adding about 3 tablespoons reserved bean liquid to create a thick puree. Garnish with green onions. Serve with warm pita bread and sliced tomatoes.
Per serving - 92 calories, 5 g fat (44% calories from fat), 4 g protein, 9 g carbohydrate, 3 g fiber, 0 mg cholesterol, 142 mg sodium