In a small bowl, combine the lukewarm milk, yeast, and 1 tablespoon of sugar. Let it stand for 10 minutes until foamy.
In a large bowl, whisk together the flour, the remaining sugar, and salt.
Add the yeast mixture, melted butter, and eggs to the flour mixture. Start kneading the dough.
Knead the dough for 10-12 minutes until it becomes elastic and smooth. If it is too sticky, add a little flour.
Cover the dough with a kitchen towel and let it rise in a warm place for about 1.5 hours, or until doubled in size.
Meanwhile, prepare the filling: In a skillet, sauté the onion until softened, then add the ground beef or cabbage and season with salt, pepper, and nutmeg.
Divide the risen dough into two equal parts. Roll out one part to the size of your baking sheet lined with parchment paper.
Spread the filling over the dough, then place the other dough sheet on top. Press down the edges to seal well.
Preheat the oven to 350°F (180°C), then brush the top of the pirog with beaten egg.
Bake for 30-35 minutes, or until golden brown and the dough is nicely puffed up.
Let it cool slightly, then slice and serve warm or at room temperature.
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