If using customized protein, pat dry and season both sides with a pinch of salt and pepper.
If using ahi tuna, cook in a medium non-stick 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. (No need to roast tuna.)
If using ribeye, cook in a medium non-stick pan with 1 tsp. olive oil over medium heat until browned on one side, 3-4 minutes. Roast, seared side up, in hot oven until steak reaches minimum internal temperature, 10-12 minutes. Rest, 3 minutes. Halve to serve.
If using chicken breasts, follow same instructions as salmon in Step 3, roasting until chicken reaches minimum internal temperature, 17-20 minutes.