Prep time: approximately 10 to 15 minutes. Cook time: approximately 15 to 20 minutes, depending on fish thickness. Total time: approximately 25 to 35 minutes. Servings: 3 to 4. Oven temperature: 400°F (200°C). The recipe uses 600 grams (approximately 1 1/3 pounds) white fish fillets, within the original suggested range of 500 to 700 grams. Cod, tilapia, haddock, or another firm white fish works well. Use 3 tablespoons olive oil, 3 minced garlic cloves, 1 cup halved cherry tomatoes, 1/2 cup sliced drained black olives, 1 small thinly sliced red onion, 1 teaspoon dried oregano, 1/2 teaspoon paprika, 1/2 teaspoon salt, 1/4 teaspoon black pepper, 2 tablespoons fresh lemon juice, optional 1/2 teaspoon lemon zest, 2 tablespoons chopped fresh parsley, and 1 medium sliced lemon for garnish. Preheat oven to 400°F (200°C) and grease a medium baking dish lightly using a small amount of the measured olive oil. Pat fish fillets thoroughly dry and season both sides with oregano, paprika, salt, and pepper. In a small bowl, combine remaining olive oil, minced garlic, and fresh lemon juice. Arrange fish in a single layer in the baking dish. Scatter cherry tomatoes, sliced black olives, and thinly sliced red onion around and over the fillets. Drizzle with the garlic lemon mixture. Bake uncovered for approximately 15 to 20 minutes until the fish becomes opaque, flakes easily with a fork, and reaches at least 145°F (63°C) at the thickest point. Thicker fillets may need additional cooking time. Remove from oven, sprinkle with fresh parsley and optional lemon zest, garnish with fresh lemon slices, and serve warm with the flavorful cooking juices. If using frozen fish, thaw safely in the refrigerator and pat dry before seasoning. Optional variations include Kalamata olives instead of black olives, drained capers, sliced zucchini, bell peppers, fresh basil, fresh dill, or crushed red pepper flakes. These variations are not included in nutrition estimates. Refrigerate leftovers promptly in shallow airtight containers at 40°F (4°C) or colder for 3 to 4 days. Reheat thoroughly to 165°F (74°C). Freeze cooked portions for up to 2 months for best quality, though vegetables may soften after thawing. Nutrition values are approximate per serving based on 4 servings, 600 grams of cod, full measured olive oil, vegetables, and seasonings. Actual values depend on fish type, olive brand, oil consumption, and portion size.