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Heat the oven to 200C/180C fan/ gas 6. Unroll the pastry with the longer side directly in front of you. Spread the Marmite over the surface. Tear the spinach over the Marmite and scatter with the cheese, making sure it’s evenly spread.
Tightly roll the pastry away from you (starting from the longer side) to create a long sausage shape, then cut into 12 pieces. Arrange over two baking trays lined with baking parchment, spiral side up, and squash down a little with your hand. Will keep covered and frozen at this stage. Bake for 15-20 mins (or 25 mins if cooking from frozen), until puffed and golden brown.