Method
Place the pumpkin in a roasting tin and coat well with oil. Sprinkle over the paprika, season with salt and pepper and roast for 30–35 minutes until tender.
Step 3Meanwhile, for the caramelised onions, place a large, heavy-based frying pan over high heat and add the oil, onion, garlic and chilli. Fry until the onion is translucent and softened.
Step 4Add the vinegar and wine and cook until the liquid has reduced by three-quarters – it should be a bit sticky and sweet and darkly coloured. Season with salt and pepper and set aside.
Step 5Peel away the pumpkin skin and place the roasted flesh in a food processor. Add the buttermilk, season with salt and pepper and whiz to a smooth paste.
Step 6Scatter a little flour on a baking tray and lay the pastry sheets on top, pressing them together so they join end to end. Brush with oil and then smear the pumpkin puree over the pastry, leaving a 2 cm border around the edge. Using a teaspoon, blob the caramelised onions over the tart.
Step 7Bake until the pastry is golden and flaky at the edges, and the base is cooked through, about 15–20 minutes.
Step 8Once cooked, sprinkle the pomegranate seeds, sorrel, almonds and pumpkin seeds over the top, and you’re ready to slice and serve.