Fresh Tuna with Tangy Onions

Yield: 8 Servings
Categories: Seafood
1tbOlive oil
2cChopped onion
1/2cRed wine vinegar
1/4tsSalt, divided
1/4tsPepper, divided
1/2cAll-purpose flour
8Tuna steaks, (4-ounce) (3/4 inch thick)
2tsOlive oil
Mint sprigs, (optional)
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