Add the yeast, sugar and olive oil to the warm water and stir until smooth.

Sift in the flour, pour in the yeast mixture, add the salt and knead a soft, elastic dough. Gather into a ball, cover with plastic wrap and leave in a warm spot for 1 hour.

Divide the risen dough into 3 pieces, stretch each one by hand into a 20-22 cm circle, forming a raised rim.

Spread the base with sauce, then top with mashed potatoes, cheese, balyk and pickled onion.

Bake for 20 minutes in a well-preheated oven at 220°C.