Recipe for puff chicken boats

Ingredients:
Dough:
Water - 170 mL
Salt - 1/4 teaspoon
Sugar - a little
Flour - about 300 grams
Butter - 30 gr (in the dough itself) and 70 gr (for puff dough)
Filling:
Onions - 1 piece
Chicken fillet - 300-400 gr
Tomatoes - 1-2 pieces
Salt, spices - to taste
Also:
1 egg to lubricate boats before baking

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