Heat 1 tablespoon oil in a nonstick skillet over medium heat. Pat salmon dry and season with salt and pepper. Cook, skin side up, until undersides form a golden crust, 12 to 15 minutes. Turn and cook until just cooked through, about 3 minutes more.
Heat remaining oil in a skillet over medium-high heat. Sauté onions until golden brown and crisp-tender, 6 to 8 minutes. Stir in vinegar, sugar, and ½ teaspoon salt and cook until syrupy, about 2 minutes. Remove from heat and stir in butter.
Spoon onions and sauce onto plates, top with salmon, skin side down.
Ingredients
Directions
Heat 1 tablespoon oil in a nonstick skillet over medium heat. Pat salmon dry and season with salt and pepper. Cook, skin side up, until undersides form a golden crust, 12 to 15 minutes. Turn and cook until just cooked through, about 3 minutes more.
Heat remaining oil in a skillet over medium-high heat. Sauté onions until golden brown and crisp-tender, 6 to 8 minutes. Stir in vinegar, sugar, and ½ teaspoon salt and cook until syrupy, about 2 minutes. Remove from heat and stir in butter.
Spoon onions and sauce onto plates, top with salmon, skin side down.