A few nights ago, der Brucer practically demanded I make Sloppy Joes. And not that Manwich stuff from a can, but fresh. So I chopped up an onion and a bell pepper, added ground beef and let that all cook for a while, then added a small can of chopped olives, a small can of green chiles, a large can of black beans, and a can each of diced tomatoes and tomato paste. (Opening the cans is good for you, if you use a hand-powered can opener. Good for the wrist muscles.) A little salt, some garlic, some cumin, let it all simmer for a while.
Meanwhile, I toasted up some English muffins (we didn't have any buns on hand, the mufins worked great), and popped some tater tots in the oven. That was a quick and easy hot meal, and qualifies as an open-faced sandwich because of the muffins!