Anatomy:

The heart is the pale green inner leaves and the firm-fleshed base, with the choke removed. The bottom is the firm-fleshed base with the leaves and fuzzy center removed. If a recipe calls for bottoms, buy larger artichokes because the bottom will be much more meaty and ample. They make delectable, edible vessels for all manner of hors d'oeuvres and individual souffl├ęs.