01 -
In a large bowl, combine flour and salt. Add oil and gradually pour in hot water while stirring continuously until ingredients begin to come together.
02 -
Transfer dough to a lightly floured surface and knead for about 6 minutes until silky smooth and soft. Cover with a bowl and let rest for 20 minutes.
03 -
In a bowl, gently toss blueberries with cornstarch until thoroughly coated. If using fresh berries, refrigerate; if frozen, return to freezer without thawing.
04 -
Bring a medium pot of salted water to a boil.
05 -
Take approximately ⅙ of the dough (keeping the remainder covered) and roll it out on a lightly floured surface to 2-3 mm thickness.
06 -
Using a 7 cm (3 inch) cookie cutter or glass rim, cut out rounds. Gather scraps and combine with remaining dough for later use.
07 -
Place a spoonful of blueberries in the center of each round, keeping away from the edges. Return unused berries to the refrigerator or freezer.
08 -
Fold each round in half, pressing edges together with fingertips to seal. Pick up each dumpling and reinforce the seal by pinching around the edge once more. Keep a paper towel nearby to wipe fingers if they become stained with blueberry juice.
09 -
Place formed pierogi on a lightly floured surface and cover with a tea towel. Cook each batch as soon as it's ready.
10 -
Carefully place pierogi one by one into boiling water (avoid overcrowding) and stir gently. Cook for 5 minutes after they float to the surface.
11 -
Pour a cup of cold water over the cooked pierogi, then remove with a slotted spoon. Drizzle with melted butter and serve immediately, or cover to keep warm while preparing additional batches.