Asparagus

You may not be a fan, but you should be.  I grew up eating this as an overcooked mushy vegetable, mostly in school lunches.  In reality it is an easy to prepare and delectable seasonal treat.  From now and for the next several weeks we can have almost daily harvests of the stuff.  After that it is a spectacular and showy plant.  Our patch is in its 4th year, and the 2nd year of harvesting (it is good to let it establish until the 3rd year).  As far as I know, this patch can grow perpetually if not over harvested.