Stuffed semolina cookies (ma'amoul)

Name: Stuffed semolina cookies (ma'amoul)
Prep time: 35 min
Cook time: 4 h
Total time: 4 h
Yield: 48 pieces
Ingredients: 600 g butter; 20 g dried yeast; 1000 g medium wheat semolina; 500 g fine semolina; 100 g sugar; 6 mastic gum grains; 14 mahleb seeds; 150 g rose water; 70 g blossom water; 200 g water; 550 g pistachio nuts, shelled, unsalted; 30 g sugar; 25 g blossom water; 50 g rose water; 100 g icing sugar