Cheats Lasagna | Australian Onions

Ingredients

• 1 tbsp olive oil
• 2 red onions, peeled, finely chopped
• 2 garlic cloves, crushed
• 500 g beef mince
• 3 x 400g cans diced tomatoes
• 1 tsp white sugar
• ½ cup fresh basil leaves, roughly chopped
• 625 g packet fresh ricotta and spinach tortellini
• 250 g piece mozzarella, thickly sliced
• fresh basil leaves, to serve
• 40 g butter, chopped
• ¼ cup plain flour
• 3 cups full cream milk
• Pinch ground nutmeg