Shape the pastry
Put one piece of pastry, on its side, in each hole. Using your thumbs, press the dough into the base and up the sides. Chill for 1 hour – warm, soft pastry is more likely to rise and puff than crisp up. If you're short on time, freeze it for 15 minutes. Meanwhile, in a pan, combine 300ml whole milk, 1 cinnamon stick and the pared zest of 1 lemon. Cook gently until just bubbling at the edges, then turn off the heat. Leave to infuse for 15 minutes.