A whole meaty tuna loin can be roasted the same way as a hunk of beef. If your loins are small—3/4 lb. or less each—you can tie them together to create a plumper-looking roast: With the widest sides together, tie at 2-in. intervals with kitchen twine. Take the tuna out of the oven when it’s still very rare—albacore keeps on cooking after it’s pulled off the heat, and if it’s overcooked, it’s dry.
Recipe: Tuna Roast with Ratatouille