Yellowfin, with its smooth, dense, mild meat — very buttery and rich — is the most popular of tunas. These tuna are a bright medium red — darker than albacore but lighter than bigeye. Yellowfin steak has a wonderful, slightly chewy, meaty texture, and is good grilled, broiled, or roasted. But it's best just seared and served rare.
For best results, rinse under cold running water and pat dry before preparing according to your favorite method.