Cut the cherry tomatoes and avocados into small pieces.
Slice the onion thinly and chop the cilantro.
Place the veggies into a large mixing bowl. Add the tuna, lemon juice, and to taste of salt and pepper. Mix well.
**NOTES & TIPS:** - Drain about half of the oil from the tuna can. This way, you’ll end up with the perfect amount of oil in the salad.