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Yield: 4 servings
Caramelized Onion Sauce:
Saute onions in oil, stirring only to prevent burning. We want the onions to be dark brown, but not burnt. Add vinegar and wine and cook 2 to 3 minutes. Add cream and cook 1 minute. Remove from heat and stir in butter to thicken. Season with salt and pepper.
Brush tuna with oil and season with salt and pepper. Sear tuna in hot saute pan 3 to 4 minutes per side. Remove and let rest 2 to 3 minutes. Serve with sauce.
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