6 Layers, 22x30 cm Dish
Prepare the Ragù:
- Heat a splash of olive oil in a large skillet over medium heat. Add chopped onions, celery, and carrots, and cook for 5-7 minutes until soft.
- Add ground beef, breaking it apart, and cook until browned, about 10 minutes.
- Stir in tomato paste for 1 minute, then add wine and simmer for 2-3 minutes.
- Pour in beef broth and tomato passata. Season with salt and pepper. Simmer on low for 35-45 minutes until thick. Set aside.
Prepare the Béchamel Sauce:
- Melt butter in a saucepan over medium heat.
- Whisk in flour and cook for 1-2 minutes until smooth.
- Gradually add milk, stirring constantly, and cook for 5-7 minutes until thickened.
- Season with salt and a pinch of nutmeg. Set aside.
Assemble the Lasagna:
- Preheat oven to 375°F / 190°C.
- Spread a thin layer of béchamel sauce (about ⅓ cup / 80 ml) on the bottom of a 22×30 cm baking dish.
- Place 2 half-size lasagna sheets side by side to cover the dish (1 layer).
- Add a layer of ragù (about ¾ cup / 180 ml), then béchamel (about ½ cup / 120 ml), and sprinkle with mozzarella and Parmesan (1-2 tbsp of each).
- Repeat 5 more times for 6 layers total, using 2 sheets per layer.
- For the top layer, use remaining béchamel (about ¾ cup / 180 ml) and a generous amount of mozzarella and Parmesan.
- Cover with foil and bake for 25 minutes. Remove foil and bake for 15-20 minutes until golden and bubbly.
- Let rest for 10-15 minutes before serving.