Heat two tablespoons of olive oil in a large skillet over medium heat. Add crushed red pepper flakes and minced garlic, sauté for about 30 seconds until fragrant.
Add halved cherry tomatoes to the skillet. Cook for about five minutes until they soften. Pour in white grape juice, chopped basil, lemon juice, lemon zest, salt, sugar, and black pepper. Simmer for another five minutes.
In another skillet, heat two more tablespoons of olive oil over medium-high heat. Season cod fillets with salt and pepper. Cook each fillet for about three to four minutes on each side until golden brown.
Pour the tomato basil sauce over each cod fillet in the pan. Cook together for another minute. Serve immediately.