Start the reduction by melting butter in a medium sauce pot on medium low

Add onions and carmelize stirring often

Add rest of reduction ingredients and bring to a simmer

Continue simmering until tomatoes are stewed and mixture reduces by at least half

When reduction is close to done, coat a heavy cast iron skillet with oil and heat until oil is almost smoking

Add cold tuna steaks to pan and sprinkle with mrs dash seasoning

Sear for two minutes each side. Sprinkle mrs dash on other side after you flip steaks

Remove from pan when steaks are cooked to rare. There should be a little pink in the middle

Immediately plate steaks. Top with warm reduction. And garnish with a small basil leaf.

Serve with herbed fettuccine and a steamed vegetable