Tomato Avocado Salad

4 cups  grape or cherry tomatoes, cut into 2 pieces

2 avocados, diced

1 lime, juiced

1/2 a bunch  chopped fresh cilantro, (about 1/4 cup)

1 tbsp extra virgin olive oil

 salt and pepper (about 1/2 tsp or more)

1/2 red onion, diced (optional