If you love ceviche, then Mexico's aguachile is for you. Traditionally made with raw shrimp, lime juice, chilies, cucumber, and onion, it's served immediately while still totally raw, unlike most other ceviche recipes. This recipe is about as close to the Sinaloa classic as you can get, and it's unbelievably delicious given its simplicity.
Look for shrimp that are fresh and have never been frozen, and tell the fishmonger you are planning to eat them raw. If you can't find shrimp that are fresh enough, you can substitute gently cooked shrimp (in which case omit the salt-curing step), or another type of seafood such as raw sea scallops or sashimi-grade fish. If you buy head-on shrimp, use the heads for another purpose, such as making seafood broth, or deep-fried as a snack.