Step 1
Mix flour, icing sugar, cornflour and butter.
Step 2
Using a rolling pin, roll out until 2mm thick.
Step 3
Line a 20cm tart tin.
Step 4
Place in the fridge for 15 mins.
Step 5
Line with greaseproof paper and baking beans and blind bake for 10 mins.
Step 6
Heat milk and butter together.
Step 7
Whisk sugar, cornflour, grapefruit juice, zest and eggs.
Step 8
Pour the hot milk mixture in and whisk.
Step 9
Return to the pan and cook on a gentle heat.
Step 10
Pour into the baked tart case and return to the oven for 15 – 20 mins.
Step 11
Heat sugar, water and glucose.
Step 12
Whisk egg whites.
Step 13
Once the syrup reaches 110°C start whisking.
Step 14
Slowly pour the hot syrup into the meringue.
Step 15
Whisk until cooled then spread on top of the baked tart.
Step 16
Use a blowtorch to colour the exterior.