Mix up the meat mix and get a steamer started. Form into small patties in the steamer and cover. Steam for a total of 8-10 minutes, flipping and pressing down with the spatula once. A minute or two before they're done, top the patties with one cheese slice each.
Cut hot dog buns into thirds. Each third is one hamburger bun, put hamburger in bun and add desired condiments.
I got a yield of 32 patties out of about 1-1/3 pounds of ground beef. The beef was "lean", no more than 20% fat. I'll generally get leaner ground beef than that, but this was on sale for 99 cents a pound.
I'd normally put cumin, mustard seed, and soy sauce into the meat mix, but I'm out of all three. Time to restock.
Next time I'll add more condiments. I'd like to try cherry tomato slices, and maybe shallot slices. I also thought it might be fun to top them with fried quail's egg.
I plan to work on baking my own tiny buns, but for now, the hot dog buns work really well.
I've been wanting to make tiny hamburgers for a long time, and never got around to it. Now that I finally have, they turned out great! Even cjo (not normally a hamburger fan) liked them. And they're fun!