Heirloom tomatoes, by definition, are open-pollinated cultivars (a plant selected for desirable characteristics that can be maintained by propagation - unlike varieties of GMO produce that have been bred to lack seeds). A true heirloom is a cultivar that has been nurtured, selected, and handed down by family members for many generations.
Typically, I've been enjoying salads with baby arugula as the base, but on this occasion, shortly after returning from my local Farmer's market, I decided to have some fun with this "Cherokee purple" tomato: