Instructions: Heat 1 tablespoon oil in a large nonstick skillet over medium-high heat.

Add onion, and saute 5 minutes or until lightly browned. Add vinegar, 1/8 teaspoon salt, and 1/8 teaspoon pepper, and cook for 2 minutes or until most of liquid evaporates. Remove the onion mixture from skillet; set aside, and keep warm.

Wipe skillet clean with a paper towel.

Combine the flour and remaining salt and pepper in a shallow dish, and stir well.

Dredge tuna in flour mixture. Heat 2 teaspoons oil in skillet over medium heat. Add tuna, and cook for 2 minutes on each side until tuna is medium-rare or desired degree of doneness.

Yield: 8 servings (serving size:
3 ounces fish and 2 tablespoons onion mixture).

Serving Ideas : Garnish with mint sprigs, if desired.

NOTES : Serve tuna with onion mixture.

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