DIRECTIONS
Heat 2 TBSP. of the oil in a large nonstick skillet over medium heat.
Add onions and 1/2 tsp. each of the salt and pepper.
Cook for 12 minutes, tossing several times, until onions have softened and are lightly golden.
Remove onions to a plate and remove skillet from heat.
Season tuna steaks with remaining salt and pepper.
Dredge in flour until lightly coated.
Place skillet over high heat and add remaining 1 TBSP. oil.
When oil is very hot (but not smoking), add tuna steaks and sear 1 minute on each side.
Remove steaks to plate.
Add vinegar, water, honey and cooked onions to skillet.
Reduce heat to medium and cook, tossing for 1 minute.
Return tuna steaks to skillet and cook 1 minute longer.
Transfer steaks, sweet-and-sour onions and pan juice to plates.
Serve with steamed green beans, if desired.