Creamy Truffle Mushroom and Spinach Pie

Trim the carrots then halve lengthways (no need to peel). Chop into roughly 1cm wide, 5cm long batons. Pop onto a large baking tray. Drizzle with oil, season with salt and pepper then toss to coat. Spread out in a single layer. When the oven is hot, roast on the top shelf until tender, 25-30 mins. Turn halfway through.

Meanwhile, heat a drizzle of oil in a large frying pan on medium-high heat. When hot, add the onion and cook until softened, 3-4 mins. Add the mushrooms and season with salt and pepper. Fry until browned, 5-6 mins, stirring occasionally. Stir in the garlic and fry until fragrant, 30 secs.

Stir in the creme fraiche, water for the sauce (see ingredients for amount) and vegetable stock powder. Bring to the boil then lower the heat and simmer until slightly thickened, 2-3 mins. Add the spinach to the pan a handful at a time until wilted and piping hot, 1-2 mins. Stir through the truffle zest and cheese until fully combined, then remove from the heat. TIP: Add a splash of water if it's a little dry. Taste and season with salt and pepper if needed.

Transfer the mix to an appropriately sized ovenproof dish. Halve the filo pastry sheets to make squares. Scrunch each filo pastry sheet into a very loose ball and place on top of the filling. Repeat until the whole pie is covered, making sure not to overcrowd the pastry. Drizzle the whole thing with oil. Once the carrots have roasted for about 15 mins, move them to the middle shelf and bake the pie on the top shelf until the filo is golden, 10-15 mins.