If using ahi tuna, pat dry and season both sides with a pinch of salt and pepper. In Step 2, skip oven, cooking tuna in a hot pan with 1 tsp. olive oil until tuna reaches minimum internal temperature, 4-5 minutes per side. Tuna is often enjoyed medium-rare (pink in the middle). For medium-rare, cook 1-2 minutes per side. Consuming raw or undercooked tuna may increase your risk for food-borne illness.
If using NY strip steak, pat dry and season both sides with a pinch of salt and pepper. Follow same instructions as salmon in Step 2, searing undisturbed until browned on one side, 2-3 minutes, then roasting seared side up until steak reaches minimum internal temperature, 10-12 minutes. Rest, 3 minutes. Halve to serve.