Tuna Rafts Dec 31, 1999 INGREDIENTS:¾ cup plain yogurt 1 ½ tsps. curry powder ¾ tsp. onion powder 18 oz. canned tuna, water packed, drained 6 Tbsps. raisins (optional) 6 English muffins, split, lightly toasted 1 ½ cups low-fat cheddar...