Custard Tarts

You know those custard tarts you buy in the shop that have disappointing amounts of custard and don't taste of anything? This isn't one of them.

Pastry:
250g flour, 185g butter, 1.5 tbsp icing sugar, 1 egg yolk, iced water. Blind bake in four/five generous muffin tins, 10mins with pastry beads 10 mins without, at 200 degrees.

Custard:
1 can condensed milk, 1.5 cups milk, 2tbsp custard powder, 1 eggs, vanilla essence. Cook in saucepan until thickened. Pour into tart casings, chill. Consume with nutmeg grated on top.