Spoon the meat and cheese filling on top of the croissants, leaving a few centimeters uncovered at the edges of the center ring. Don't be afraid to pile it on! I've never had it leak out while cooking, so use as much or as little as you like (more is better!). Once you have it filled to your liking, start pulling up the dangling pieces of croissant. Smoosh the tips into the dough you left uncovered by the meat mixture. You may have to stretch the dough a little to do this, and that's perfectly fine. I like to position the dough in a slanted angle, just because it looks nicer than leaving it perfectly straight. To use up the left-over croissants, place a small amount of meat in the center and fold so that you make a bundle that looks a little like a diaper. Cook until the top of the croissants become golden brown and the bottom firms up (a doughy bottom isn't very pleasant).