Vegetable pierogi with mushrooms. Gluten Free

Today we have on the menu juicy and hearty gluten-free Vegetable pierogi with mushrooms
Recipe
Dough:
Water 60 ml
Salt 1/3 teaspoon
Flax seeds 3 tablespoons - as flax flour (4 tablespoons)
Green buckwheat flour 7-8 tablespoons
Egg (large) 1 pc
Filling:
Boiled beans 200 g
Champignons 3 pcs
Salt 1/2 tsp
For submission: (optional)
Mayonnaise or sour cream
Mung bean sprouts
Cucumber
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