adapted from The Campout Cookbook by Marnie Hanel and Jen Stevenson (ingredients listed are for each foil packet, simply scale up for more people)
Layer the ingredients in the order listed. Remember that your end goal is a steam packet, so go for layering ingredients in the center and folding up the sides and edges, crimping and folding to make tight seals. Once I've layered in my ingredients, I like to start with the long sides of the foil, and bring them up and over the ingredients to form a tight center seam. Then I crimp and fold the other two edges, bending the foil up so as not to leak any beer.
We cooked ours about 20 minutes, set on a grate over coals that still had fire going. Perfect! Original recipe says to "bake in embers" 10 - 15 minutes". Serve with a good loaf of sourdough.