Cover the inside and outside of the box completely with 3 or 4 layers of aluminum foil, including the flaps. Lay box on level ground so that the opening opens oven style (front door style is OK, too).
Straighten the coat hangers, then run them through the sides of the box about 2/3 of the way up from the bottom to form a rack. Set brick in bottom. Place live coals into pie pan/pie plate. Put pan on brick (don't forget, the PIE PAN IS HOT! Use an oven mitt or hot pad). Place food to be cooked onto coat hanger rack and close oven door. Watch carefully, checking often. Each live coal makes about 80 degrees Fahrenheit.