Ingredients

• 2 tablespoons olive oil
• 375 g lean ground beef
• 1 onion , finely chopped
• 3 cloves of garlic , finely chopped, divided
• 2 teaspoons dried oregano
• 1 zucchini , finely chopped
• 1 680 ml bottled strained tomatoes (passata)
• 1 pinch granulated sugar
• 4 fresh lasagna sheets , cut into bite-size pieces
• salt and pepper
• 2/3 cups extra-fine ricotta cheese
• 1/2 cup grated parmesan cheese
• 1/2 cup chopped fresh basil
• 1 egg yolk
• 3/4 cups grated mozzarella cheese