Tuna Stuffed Avocado

Name: Tuna Stuffed Avocado
Prep time: 15 min
Total time: 15 min
Cuisine: American, Mexican, Latin American
Ingredients: one 5 oz. can tuna packed in olive oil (see notes); 1 large ripe avocado; 2 T very finely chopped red onion; 1/4 cup finely chopped cilantro; 2 tsp. olive oil; 1 T Mayo; 1 T fresh-squeezed lime juice (more or less to taste, see notes); sea salt (or salt) and fresh ground black pepper to taste; additional lime for serving, if desired