Execution
Follow the master commands
Preheat the oven to fan 170C/ conventional 190C/gas 5. Roll out the pastry on a lightly floured surface so it’s slightly thinner than straight from the pack. Then cut out 18-20 rounds with a 7.5cm fluted cutter, re-rolling the trimmings. Use the rounds to line two deep 12-hole tart tins (not muffin tins). If you only have a regular-sized, 12-hole tart tin you will be able to make a few more slightly shallower tarts.
Beat the eggs in a large bowl and combine with the rest of the ingredients except the walnuts. Tip this mixture into a pan and stir continuously for 3-4 minutes until the butter melts, and the mixture bubbles and starts to thicken. It should be thick enough to coat the back of a wooden spoon. Don’t overcook, and be sure to stir all the time as the mixture can easily burn. Remove from the heat and stir in the nuts.
