In a saucepan over medium heat, bring butter & milk to a boil.
Mix all-purpose flour,semolina flour,& sugar in a large bowl. Power hot milk mixture into flour mixture all at once, beating constantly with a wooden spoon until cool

Using fingertips,rub in orange blossom water until fully incorporated.

Cover with kitchen towel & left set for at least 4 hours (or preferably over night).

Preheat oven to 180 c(359 f)

Knead dough by hand for 5 minutes until soft & pliable.shape dough into walnuts -size balls.

Press thumb into balls to make cups. Fill cups with a generous teaspoon of pistachios filling. Mold dough over filling,pressing seam to seal. Roll into balls. If desired, press balls into decorated molds, tapping them out onto a work surface. Arrange on a baking sheet

Bake on a middle race of oven for 25 minutes, our until golden.