01 - Set oven temperature to 375°F to prepare for baking the cabbage rolls.
02 - Bring a large pot of salted water to a rolling boil. Carefully remove 12–14 whole leaves from the cabbage head. Blanch the leaves in boiling water for 3–4 minutes until they become pliable and easy to roll. Drain thoroughly and set aside on a clean surface.
03 - Heat 1 tablespoon olive oil in a skillet over medium heat. Add the chopped onion and sauté for 3–4 minutes until translucent and softened. Add the minced garlic, grated carrot, and chopped celery; continue cooking for another 3 minutes until vegetables are tender.
04 - Stir the cooked lentils, rice, tomato paste, smoked paprika, dried thyme, dried oregano, pepper, and salt into the sautéed vegetables. Cook the mixture for 2–3 minutes, stirring constantly to combine flavors. Remove from heat and fold in the chopped fresh parsley.
05 - In a mixing bowl, combine the crushed tomatoes, olive oil, dried basil, sugar, salt, and pepper. Whisk thoroughly until all ingredients are well incorporated and the sugar has dissolved.
06 - Using a sharp knife, carefully trim the thick vein at the base of each cabbage leaf to make rolling easier. Place 2–3 tablespoons of the filling mixture at the bottom of each leaf. Fold in the sides toward the center, then roll tightly from the base to the tip of the leaf.
07 - Spread a thin layer of the prepared tomato sauce evenly across the bottom of a large baking dish. Place the cabbage rolls in the dish, arranging them seam-side down in a single layer.
08 - Pour the remaining tomato sauce over the cabbage rolls, ensuring each roll is generously coated. Cover the baking dish tightly with aluminum foil to trap moisture during baking.
09 - Place the covered baking dish in the preheated oven and bake for 40 minutes, allowing the cabbage to become tender and the filling to heat through completely.
10 - Remove the foil and continue baking for an additional 10–15 minutes until the sauce is bubbling and the tops of the cabbage rolls are slightly browned.
11 - Remove the dish from the oven and let the cabbage rolls rest for 5 minutes before serving. This allows the filling to set slightly and makes them easier to handle.