Pistachio and lime tartlets

Sweet Pastry
1 egg
250 g flour
30 g pistachio powder
90 g icing sugar
120 g softened butter

For 8 tartlets
Whisk together the softened butter, sugar, and pistachio powder
Pour in the egg and continue mixing
Add the flour, mixing by hand. Do not overwork the dough, otherwise it will be tough after baking
Wrap the dough in plastic wrap and chill for 1 hour
Flour the work surface and roll out the dough to a thickness of 0.3 cm
Line the tart molds with the dough and freeze for 15 minutes
Preheat the oven to 180°C
Bake blind for 10 minutes