If you are going to cook over an open flame, light it now.

Dust the tuna with fajita seasoning and set it aside.

Peel onion, cut in half, and thinly slice.

Cut bell peppers in half, seed, core, and thinly slice.

Saute the onions.

Lightly saute the peppers.

Toss them together after they are cooked, and set aside.

Cook the tuna now - quickly sear over the hot flames or in a hot lightly-oiled pan. Remember: Don't overcook!

Cut the tuna into the traditional fajita strips and toss with the onion-bell pepper mixture.

Heat the tortillas or not; it is up to you, but remember that a heated tortilla hardens when it cools. Now, sit down and assemble your masterpieces of yummy goodness.