• 1 tbsp. powdered sugar, or more to taste
• 1/4 tsp. freshly ground nutmeg (or cinnamon, if you prefer)
Combine the flour and salt in a bowl, then make a well in the middle. Add the egg, additional yolk, ½ cup water and sour cream. With a fork, start whisking the liquid ingredients, slowly bringing in flour from the sides until the dough comes together. Add a spoonful of water if necessary. Turn the dough out onto a well-floured surface and knead gently, flouring your hands when necessary, until the dough is a smooth, pliable ball. Cover with a towel and let rest for 45 minutes.
In another bowl, toss the powdered sugar with the lemon zest, then add blueberries, tossing to coat.
Begin heating 4 quarts of water in a large pot. While the water is heating, make the pierogi.