This is based on a recipe in Mollie Katzen's "Vegetable Heaven." She uses lima beans instead of edamame, but I've discovered that edamame is yummier. Back when I made it with limas, I had a friend who hated both lima beans and olives, and still begged me to make this dish all the time, so try it, even though the ingredient combination sounds weird! At least around here, sliced green olives are nowhere to be found, and whole ones tend to come either with the pit intact or stuffed with something, unless you go to a fancy store with an olive bar. I use the ones stuffed with garlic, slice them myself, and cut down the amount of garlic accordingly.