Casa Amadeo, more commonly known as "that snails place in the Rastro", is a La Latina classic. They specialize first of all in snails, served sizzling in a pungent broth of chorizo grease, ham, and God-knows what other deliciousness. If you're a snail novice, grab a toothpick and pluck the shrimp-sized gastropod from its shell, pop it in your mouth, and suck the remaining sauce out of the shell. It's heavenly. It's recommend trying at least a 1/2 plate of snails, even if the idea of eating them seems kind of gross (they are, of course, delicious, and taste/texture somewhat similar to mushrooms). Casa Amadeo also specializes in old-school Madrid fare, which basically means chorizo, tripe, and all matter of hoofs, snouts, tails, and ears, usually doused in a garlicky chorizo sauce. We got a 1/2 plate of snails and 1/2 plate of satisfying pig's ear cooked with chorizo, garlic, chili pepper, and parsley. It's not gourmet by any stretch of the imagination, but it's legit Madrid food served in an environment that hasn't changed a thing in probably 40 years. I'd recommend steering clear on Sundays when the place gets overrun by tourists, and heading there as part of a La Latina tapas crawl on Thursday, Friday, or Saturday evening.