Heat 2 tablespoons olive oil in a large sauté pan over medium heat.
Add the crushed red pepper flakes and minced garlic. Sauté for about 1 minute, stirring frequently, until fragrant. Do not allow the garlic to brown.
Add the halved cherry tomatoes. Cook for 8–12 minutes, stirring occasionally, until the tomatoes are softened and beginning to blister but still retain some of their shape.
Pour in the vegetable or seafood broth and white grape juice. Stir well and bring the mixture to a gentle simmer.
Add the fresh basil, lemon juice, lemon zest, salt, sugar, and black pepper. Cook for another 2 minutes. Taste and adjust the salt, pepper, or lemon as desired.
Transfer the tomato basil sauce to a bowl and set aside.
Pat the cod fillets thoroughly dry with paper towels. Season both sides with salt and black pepper.
Heat the remaining 2 tablespoons olive oil in a large nonstick skillet over medium heat.
Carefully place the cod into the hot skillet. Cook undisturbed for approximately 3 minutes, until the underside develops a golden crust.
Carefully flip each fillet and cook for another 3–4 minutes, depending on thickness, until the fish is opaque and flakes easily. For food safety, fish should reach an internal temperature of 145°F (63°C).
Spoon the prepared tomato basil sauce over the Pan-Seared Cod Recipe and allow everything to warm together for about 1 minute.
Remove from the heat and serve immediately with plenty of tomatoes and sauce spooned over each cod fillet.