Chop or shred lettuce and add to bowl. Squeeze juice of 1/2 small lime and sprinkle with tsp of cilantro. Toss together.
Halve cherry tomatoes. Mix with chopped onions and 1 tbsp of cilantro. Squeeze juice of 1/2 lime over and mix.
Add brown rice to side of bowl. Squeeze with juice of 1/4 lime and sprinkle with tsp of cilantro.
Heat corn in microwave (or on stove top) and add to side of bowl.
Rinse and drain black beans. Heat 1/2 cup in microwave (or stove top). Squeeze juice of 1/4 lime on top. Add some chopped onion and cilantro. Mix. Add to bowl.
Add tomato-onion-cilantro mixture to center of bowl.
Slice 1/2 avocado (you can cube also). Squeeze juice of 1/4 slice of lime on top. Add to bowl.
Squeeze juice of 1/2 - whole lime on top of bowl.
Top with a sprinkle of chopped cilantro.