Mini Blueberry Tarts

Combine butter, wheat flour, powdered sugar, and salt in a food processor or by hand with two forks into fine crumbs.

Add the ice water and egg yolk and quickly process into a smooth, slightly sticky dough – make sure not to over-knead it.

Divide the dough into 5 equal portions (about 60 g each) and place them in the refrigerator for at least 45 minutes.