A gorgeous recipe - puff pastry topped with sweet potato, cubes of butternut and chevin, all brushed with thyme oil and baked to golden perfection. Serve as a starter or alongside a crunchy salad for lunch. —Teresa Ulyate
very small sweet potatoes (about 400g), skins on and scrubbed
Preheat your oven to 200°C. Roll out your puff pastry and cut out four 14cm circles. Place the pastry rounds on a greased tray and pop in the fridge.
Arrange the whole sweet potatoes and butternut chunks (in a single layer) on a greased baking tray. Roast for 15 minutes. Remove from the oven and set aside until cool enough to handle. Peel the potatoes and cut into 5mm slices. Cut the butternut chunks into smaller cubes.
Combine the olive oil, garlic, thyme and some salt and pepper in a small bowl and set aside.
Arrange the pastry circles on a greased tray, allowing some room for spreading. Beat the egg and brush lightly over the pastry. Spoon a layer of sour cream onto each round, leaving a 1/2 cm border. Don't worry if its not perfectly even.
Arrange a layer of sweet potato slices over the sour cream. Scatter the butternut cubes over the top.
Use your hands to break the chevin up into small chunks and dot them over the tarts. Lastly, gently brush the tarts with some of the thyme oil. Reserve a little of the oil for when they come out of the oven.
Bake the tarts for 25-30 minutes until the pastry is golden and has risen. Brush them with the remaining thyme oil and serve immediately.