Immediately sear on high heat each side for 10 seconds for pink in the middle, or for no more then 30 seconds to cook through well. Sheet pan recipes are becoming a favorite from readers! Ahi tuna, also known as yellowfin tuna, has a deliciously meaty taste. Press spice mixture to adhere. Try easy Sheet Pan Balsamic Chicken with Potatoes and Carrots, Sheet Pan Teriyaki Chicken and Pineapple Fried Rice, and Healthy Sheet Pan Chicken Fajitas.. Remember, if you have more than 2 8 oz tuna steaks, you might need to adjust the ingredients to marinate. Marinate both sides (dredge steaks and get marinade on both sides). Toss the ahi tuna in melted butter and then coat with spice mixture on both sides. This hearty fish is an excellent source of protein, is low on fat, and it's extremely simple to prepare. Let sit in refrigerator for 30 minutes before grilling. In a shallow 9 X 13 inch glass dish, prepare all of the marinade ingredients. Serve immediately. Bold and flavorful sheet pan tuna steaks with tender, seasoned baby potatoes made easy on one sheet pan, ready in just 30 minutes!. Ahi tuna steaks are mostly grilled or seared to bring out the best in their flavour, but you can also bake them to …