California's Green Globe is a popular variety of this veggie with an edible heart
This "seed" variety was developed by the University of California (
famous for... [DOC] [TLE] Vegetables - Ingredients Descriptions and Photos - An All-Creatures ... [PAR] The edible portion of the "globe" is composed of the fleshy bases of the flower 
bracts ... to which the bracts are attached, commonly referred to as the "heart.