First, sauté diced onion in olive oil. Then add the beans. If you have more beans than I did (one pound) do half at a time.
Stir around so the beans get covered in the oil; season to taste with salt and pepper. Then let 'em sit there and get all black and blistery. Tasty, right? :) The onions get sweet and caramelized, and the beans get *just* tender, but not mushy in the least.
We served these with grilled local beef burgers and cheese from our great state.