1 large egg
⅔ cup ice water
1 cup all-purpose flour
1½ teaspoons salt
½ teaspoon baking powder
2 cups sauerkraut, drained, liquid reserved
1 cup finely grated Pecorino Fiore Sardo
2 to 3 tablespoons unsalted butter, divided
⅔ cup fresh whole-milk ricotta
Freshly ground black pepper