Beer Carmalized Onions

We grilled on our outdoor fire pit for the first time this afternoon, and I had a moment of inspiration as I was boiling the brats in beer. Once I put the brats on the fire pit, I skimmed the foam off the beer and left a thin layer of beer in the bottom of the pot, enough to cover my onion slices. I then cooked on low heat (about 3) while the brats cooked. The end result was a beer reduction that caramelized the onions ... amazing.