This is a good one. Easy, too.
Seared Tuna with Yummy Sauce
1lb #1 sashimi grade Ahi tuna
3 tablespoons Tamari soy sauce
3 tablespoons fresh-squeezed lime juice
1 tablespoon Chinese mustard
1 tablespoon peanut oil
Put the peanut oil in a saute pan on medium-high heat. In a small bowl, mix the soy sauce, lime juice, and mustard together with a fork. Mix it really, really well. Oh, and feel free to add a little wasbabi powder and/or pickled ginger to the mix.
When the oil is hot, sear the tuna for 15-25 seconds on each side.
Slice very thin, and arrange artfully (fanning looks nice) on plates, then drizzle on the sauce.
Serves two rather well.