Hearty Mushroom & Leek Lasagne

• In a large frying pan, heat a generous drizzle of olive oil over high heat. Cook mushrooms, stirring, until tender, 8-10 minutes. • Add half the garlic and cook until fragrant, 1 minute. Season with salt and pepper. Transfer to a small bowl. • Return the frying pan to medium-high heat, with a drizzle of olive oil. Cook onion, leek and carrot, stirring, until softened, 6-7 minutes. • Add Nan's special seasoning and remaining garlic and cook until fragrant, 1-2 minutes.

• Reduce heat to medium, then add vegetable stock powder, passata, the brown sugar, butter and water and cook until thickened, 1-2 minutes. Season to taste. • Season with pepper. Stir through baby leaves until wilted.

• Heat a medium saucepan over medium heat with a drizzle of olive oil. Cook the plain flour, stirring, until a thick paste forms, 2 minutes. • Remove pan from heat, then slowly whisk in the milk until smooth. • Stir through grated Parmesan cheese, then season with salt and pepper.

• Spoon half the veggie mixture into a baking dish. Top with a lasagne sheet (lay two sheets alongside each other for 4 people). • Repeat with the remaining veggie mixture and lasagne sheets. • Arrange garlicky mushrooms in a single layer on top of lasagne. Using the back of a spoon, spread the white sauce over the mushrooms. • Bake lasagne until golden, 20-25 minutes.