Spaghetti lentil bolognese

Ingredients

• 2 tablespoons olive oil
• 1 large onion, finely chopped
• 2 garlic cloves, crushed
• 2 tablespoons fresh basil, coarsely chopped
• 1 teaspoon dried oregano leaves
• 400 grams can diced tomatoes
• 400 grams can tomato purée
• 400 grams can brown lentils, drained, rinsed
• 400 grams spaghetti
• 25 grams finely grated pecorino cheese
• 2 tablespoons basil leaves, plus extra to serve