Pre heat your oven to 350 F.
Roll out your dough on a lightly floured surface to about 1/4 cm thick. You want it to be thin otherwise it will open during baking.
Using a cookie cutter or glass, cut out 2-3 inch cookies. Keep rolling out your dough until you’ve used it all.
Place 1 tsp of filling in the centre of each circle.
Fold over the right side of the circle, creating a point at the top.
Next, fold the left side of the circle so the fold overlaps the first to make a point.
Finally, fold up the bottom piece up and over the other two fold, creating a triangle.
Press corners to seal.
Mix the egg and water together, then brush each cookie with the egg wash.
Bake the hamantashen for 12-14 minutes until edges are slightly browned.