There's no better topping for a green bean casserole than crispy fried onions. But when you're serving up a matherole, you need something more cerebral as a garnish. And Vihart has just the thing with a recipe for borromean onion rings.

Each serving is like three onion rings in one, but the mathematical magic is that while no two of the rings are directly connected, all three are intertwined together in a flavorful fusion. And while your dinner guests probably won't notice as they scarf them down, at least you'll feel enriched for bringing a little extra science to supper. [YouTube]