Pepper-Stuffed Tuna Boats

canned chunk white tuna in water

⅓ cup(s), drained

red onion

1 tbsp(s)

reduced calorie mayonnaise

2 tsp(s)

red bell pepper

½ small, sliced in half lengthwise

capers

2 tsp(s)

fresh parsley

2 tsp(s), chopped