You can use other summer fruits such as sliced apricots or peaches. If you would like a warm filling, make the pastry cream after you have cooked the pastry. Use a vegetable peeler to lightly peel the rind off the lemon - leave the white pith behind.
Pastry cream
| 450 ml | Whole milk, full cream milk | 
| 1 | Vanilla pod, split | 
| 5 | Eggs, yolks | 
| 1 | Lemon, pared rind | 
| 1 cup | Caster sugar | 
| 2 Tbsp | Flour | 
| 1 Tbsp | Cornflour | 
