Beef and mushroom lasagne

Ingredients

• 2 teaspoon olive oil
• 750 gram beef mince
• 1 chopped onion
• 250 gram chopped mushrooms
• 1 grated zucchini
• 2 clove garlic, crushed
• 700 millilitre jar passata
• 1 teaspoon dried oregano
• 375 gram packet fresh lasagne sheets
• 2 250 gram packets frozen spinach, well drained
• 750 gram ricotta
• 1/2 cup parrnesan, grated
• 1/2 teaspoon ground nutmeg
• 1 thinly sliced tomato