Fresh wild flounder fillet, sold by the pound at the Costco seafood counter. Flounder is a lean flatfish prized for its mild, delicate flavor and fine flaky texture, making it one of the most versatile white fish available. Because it is wild-caught rather than farm-raised, it feeds on a natural diet in its ocean habitat, which many cooks and nutritionists consider preferable for both flavor and nutritional profile.

The thin, boneless fillets cook quickly and absorb seasonings and marinades well. Flounder is well suited to pan-searing, baking, broiling, steaming, and light breading for fish and chips or fish tacos. Its mild taste pairs naturally with butter, lemon, capers, fresh herbs, and light sauces. Thinner fillets typically cook through in just three to five minutes per side over medium-high heat. As a fresh product sold by weight, it should be cooked within one to two days of purchase or frozen immediately upon returning home.