Ingredient: tomatoes, peeled, seeded and chopped (see Tip)

How To Prepare
Preheat oven to 400°F.
Heat 2 teaspoons oil in a wide saucepan over medium heat. Add peppers, onions and garlic and sauté until softened, 2 to 3 minutes. Add tomatoes, fish stock (or water) and wine and bring to a boil. Cook, uncovered, over high heat until thickened, about 10 minutes, stirring frequently. Stir in rosemary and season with pepper.
Meanwhile, brush both sides of the tuna steaks with remaining 1 teaspoon oil and season both sides lightly with pepper. Heat an ovenproof, nonstick skillet over medium-high heat until almost very hot. Sear the tuna until lightly browned, 1 to 2 minutes per side. Place the pan in the oven and bake until the fish is opaque, about 10 minutes. Place the tuna on individual plates and spoon the tomato mixture on top.
TIPS & NOTES
Tip: To peel & seed tomatoes:
1. Before you start, bring a large pot of water to a boil. Place a large bowl of ice water next to the stove. Using a sharp paring knife, core the tomatoes and score a small “X” into the flesh on the bottom.
2. Place the tomatoes in the boiling water, in batches, until the skins are slightly loosened, 30 seconds to 2 minutes.
3. Using a slotted spoon, transfer the tomatoes to the ice water and let sit in the water for 1 minute before removing.
4. Peel the tomatoes using a paring knife. Halve them crosswise and scoop out the seeds with a hooked finger.