In a medium bowl, combine the heirloom tomatoes, mango, garlic, lime, cilantro, red onion and serrano, if using. Stir in the avocado, if using and season with salt and pepper to taste. Chill until ready to use.Serve by itself with chips, scoop it into tacos, or top it onto the black bean patty recipe below.
Recipe by Love and Lemons at https://www.loveandlemons.com/heirloom-tomato-mango-pico-de-gallo/