Simple, fast, delicious! Not only for fasting.
In the mineral water, add salt, sugar, oil. Stir, add the flour.
Kneaded dough (thick, should not stick to hands). Divided into equal balls. Roll out each ball, put the filling (any according to your taste, not necessarily lean!) I have mushrooms and onions. Banded edges, unrolled.
Fry on medium heat on both sides in vegetable oil.