Roasted Tuna with Caramelized Onion and Balsamic Glaze
Prep
20 mins
Cook
35 mins
Servings
4
Difficulty
Medium
This is one of my favorite weeknight dinners because it comes together in just about an hour and tastes like you spent all day cooking. The tuna steaks are seared to perfection while the onions slowly caramelize into sweet, golden strands that contrast beautifully with the tangy balsamic glaze. Tuna is packed with omega 3 fatty acids, which are wonderful for heart health, and the simple preparation lets the fish shine without any fussy techniques. Best of all, most of these ingredients are pantry staples, so you probably have everything on hand already.
Ella x
Ingredients
- 4 piecestuna steaks(6 oz each, about 1.5 inches thick)
- 3large yellow onions(thinly sliced)
- 4 tablespoonsextra virgin olive oil
- 3 tablespoonsbalsamic vinegar
- 1 tablespoonhoney
- 3 sprigsfresh thyme
- 3garlic cloves(minced)
- 1 teaspoonsea salt
- ½ teaspoonblack pepper(freshly ground)
- ¼ teaspoonred pepper flakes(optional)
- 1lemon(zest and juice)
Detail level
Instructions
- 1
Heat 2 tablespoons of olive oil in a large skillet over medium heat. Add the sliced onions and cook, stirring occasionally, for 12-15 minutes until they turn golden brown and caramelize.
Tip: Don't rush the caramelization process; low and slow heat brings out the natural sweetness of the onions.
- 2
Add minced garlic and fresh thyme sprigs to the caramelized onions. Stir for 1 minute until fragrant, then reduce heat to low and set aside.
- 3
In a small bowl, whisk together balsamic vinegar, honey, and lemon juice. Pour this mixture into the onion skillet and simmer for 5 minutes until the glaze becomes slightly syrupy.
Tip: The glaze should coat the back of a spoon when ready.
- 4
Pat the tuna steaks dry with paper towels and season generously on both sides with sea salt, black pepper, and red pepper flakes.
Tip: Drying the tuna ensures a better crust when seared.
- 5
Heat the remaining 2 tablespoons of olive oil in another skillet over high heat until it shimmers. Carefully place the tuna steaks in the hot pan and sear for 2-3 minutes per side for medium-rare, or 3-4 minutes per side for medium.
Tip: Don't move the steaks while cooking; let them develop a golden crust without disturbing them.
- 6
Transfer the seared tuna steaks to serving plates and top each one generously with the caramelized onion and balsamic glaze mixture.
- 7
Garnish with fresh lemon zest and any remaining thyme sprigs. Serve immediately while the tuna is still warm and the onions are at their peak flavor.
Tip: A drizzle of quality olive oil on the plate adds an elegant finishing touch.
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