Finally got around to trying these tonight. My wife came across a big sale on ground beef, so we invited the kids over for dinner. Start with tennis ball sized meatballs. Add a shot glass. A wrap of my own peppered bacon. Remove the glass. And you have a pic of a bunch of empty burger shots. This is where I put down the phone and started filling, forgetting to take another pic. Most were filled with cooked breakfast sausage and grilled onions. A few others held chili, and the rest went with pepperoni and pizza sauce. At the half hour mark. I topped them with some cheese that I had smoked previously. Grilled indirect at 300°. Done at 1 hour. The cheese held to some better than others. And plated. They were a big hit!