Biscuits with date, pistachio and cardamom filling

Dough

• 120 g water
• 110 g butter, cut in pieces
• 250 g flour
• 1 tsp baking powder
• 1 pinch salt

Filling

• 30 g unsalted pistachio nuts
• 10 g butter
• 300 g pitted dates
• 1 tsp ground cardamom

Assembling and baking

• 1 egg
• 1 tbsp water
  of 1 tbsp milk
• 20 g sesame seeds