The mustard idea I got from Wolfgang Puck on a recipe he used with Ribeyes. I substittuded sauted onion rings for fried,pork for beef, added the shrooms and tomato. Came out fantastic, with requests to do it again.
These fiery little friends are great for race days, tailgate parties and Sunday afternoon playoffs. Not suitable for synchronized water ballet get-togethers, though. After the last touch of oil is added they could be char-grilled if you don't want to heat the oven.
I like roasting chickens on one of those upright stands. Flavors run down thru the poultry, and excess fat drains out; and you can watch it turn nice and brown as it cooks. Herbs and spices can be added to the pepperoni when "stuffing". Carve and serve this dish with your favorite pasta and marinara sauce