Creating Pan-Seared Mediterranean Cod in Tomato Basil Sauce is easy when you follow these straightforward steps:

1. Prepare the Cod: Pat the cod fillets dry with paper towels and season both sides with salt and pepper.
2. Heat the Pan: In a large skillet, heat the olive oil over medium-high heat until shimmering.
3. Sear the Cod: Carefully place the cod fillets in the skillet. Cook for about 4-5 minutes on each side, or until golden and cooked through. Remove the fillets from the pan and set aside.
4. Sauté Onions and Garlic: In the same skillet, add diced onions and sauté for about 2-3 minutes until translucent. Add minced garlic and cook for an additional minute.
5. Add Tomatoes and Seasonings: Pour in the crushed tomatoes, along with dried oregano, black pepper, and red pepper flakes (if using). Stir well and let it simmer for about 5 minutes.
6. Add Fresh Basil: Stir in the chopped basil and lemon juice. Let it simmer for another minute to blend the flavors.
7. Return Cod to the Pan: Gently place the seared cod fillets back into the skillet, spooning the sauce over them. Let the fillets warm through for a couple of minutes.
8. Serve: Remove from heat and garnish with extra basil leaves if desired.