Shortcrust pastry Samsa recipe. Unusual and very tasty

Recipe
Flour - 450 gr
Baking powder - 1.5 tsp
Salt - 1 tsp
Sugar - 1 tsp
Kefir - 200 ml
Meat - 350 gr
Onion - 2 pcs
Vegetable oil - 40 ml
Salt - 0.5 tsp
Paprika - 1 tsp
Zira - 0.5 tsp
Coriander - 0.5 tsp