Our best guess as to why has to do with raw fish not being an ingredient many cooks in the U.S. are used to working with at home. Much like crudo—or sushi, or clams on the half shell—ceviche is a dish that, perhaps for its perceived delicacy or the fact that it requires pristine product, many diners tend to reserve for restaurant orders. In reality, ceviche checks all the summer entertaining boxes: it's effortless but impressive, ready in a pinch, and won't break the bank. Plus, you can find the fish you need at almost any seafood counter.

We've fallen in love with this simple version, inspired by the cookbook Nopalito, written by chef Gonzalo Guzmán with SAVEUR's editor-in-chief Stacy Adimando. It includes a base of tomatillos and lime, and comes from a Mexican tradition called campechana—which Guzmán describes as the blending of two fish (in this case, calamari), one less expensive than the other—to help stretch the dish to feed more people for less. The book includes a few types of ceviche, some made with puréed dried red chiles—since they're available year-round—and others with fresh in-season crab or tiny, ripe cherry tomatoes. But this squid and white fish rendition stands out to us for its tart, refreshing flavors and eye-catching appeal: The tender purple tentacles of the quick-cooked calamari are stunning alongside the bright and tangy green broth.

Here are some guidelines for acing the dish.

While this may sound like a no-brainer for ceviche, it has to be said. In a dish where you are meant to taste the true flavors of the barely cooked seafood, freshness is everything. Shop at a place with high turnover, and ask the fishmonger which white fish is freshest that day. You can use halibut, cod, or another firm, mild-flavored fillet. Buy it skinned and deboned so it’s ready to use when you get home.

When shopping for calamari, look for bright white bodies and make sure the squid smells clean and briny (not fishy). While you can usually find it pre-cleaned, with bodies and tentacles separated, here’s how to clean whole calamari yourself if needed: Slice the squid in half lengthwise and scrape away and discard anything remaining inside. Remove and discard any clear, filmy pieces that cling to the flesh. Trim away the ink sac and eyes if included, and remove and discard any firm pieces of cartilage, then separate the tentacles from the body.

While certainly not required, beautifully bubbly home-fried tortilla chips really up the wow factor—and flavor impact—when you’re serving ceviche. They also tend to be hardier and slightly thicker than store-bought chips, meaning they’ll do a better job of scooping up substantial mounds of ceviche. You can also salt them to taste, preserving the balance of overall saltiness across the chip and the fish.

Though this formula is relatively fail-proof, some limes and tomatillos will inevitably be sweeter, juicier, or more acidic than others. Certain types of fish also vary in flavor, ranging from mild to strong, and levels of salt. As a result, you may need to adjust the quantity of lime juice, tomatillo liquid, salt, or chiles to get the flavor and consistency you want.

Ceviche is technically marinated—not cooked—seafood, but the highly acidic lime juice helps to “cook” the raw fish slightly as it sits. As it rests, it will continue cooking, sometimes past the point where the flesh remains tender and delicate-tasting. Because of this, ceviche has a precise serving window—about five minutes after it is initially mixed, and not much longer than that.