Dice tomatoes into approximately 1/3 to 1/2 inch dice and place in a medium-sized bowl.
Dice onions into approximately 1/4 to 1/3 inch dice and add to the tomatoes.
Dice shrimp into 1/2 inch dice and add to the tomatoes and onions.
Dice avocado, toss gently with lime juice in a small bowl, and set aside.
Add garlic, cilantro, and spices to the tomato mixture and toss to combine.
Gently fold in the avocados and lime juice to the tomato mixture.
Serve within an hour.
Serve with scoop chips.
Notes
If you want to prepare this ahead of time, mix up everything but the avocado and lime juice. Add them right before serving.This is delicious the day after, but I wouldn't go much longer than two days given the shrimp in the recipe.