The way to tell them apart is that the Fatty Slider is made from a combination of ground beef and house-cured lardo, plus a pungent paste made from shallots, galangal root, coriander seed, and fish sauce, and is absolutely delicious, while a Lipton onion burger is made by mingling ground chuck with dehydrated onions, and is not.
You should also know that Fatty Sliders come two to an order on toasted potato buns with a pickle, Bibb lettuce, and a slathering of sambal aïoli, and are available on the weekend brunch and late-night menus at Fatty Crab, whereas Lipton onion burgers are served once or twice a week at fine suburban split-levels everywhere. — Rob Patronite and Robin Raisfeld
Fatty Crab, 643 Hudson St., nr. Horatio St.; 212-352-3590