In a small bowl, whisk together the egg and water. In a medium bowl, sift together the flour, salt and baking powder. Mix the egg mixture into the dry ingredients until well combined, cover with plastic wrap, and refrigerate for 30 minutes or up to 6 hours.
2
Once chilled, stir in the sauerkraut and Pecorino. The mixture should be the consistency of pancake batter; if it is too thick, thin the batter with 1 to 2 tablespoons of the reserved sauerkraut liquid.
3
In a large skillet set over medium heat, melt 1 tablespoon butter. Repeatedly ladle about 2 tablespoons of batter into the pan, leaving about 1 inch between pancakes (each pancake should be about 2 inches in diameter; take care not to overcrowd the pan).
4
Cook until golden and crisp around the edges, 3 to 4 minutes, then dollop each pancake with about 1 teaspoon ricotta. Flip the pancakes and cook the other side until golden, 30 to 45 seconds more. Transfer to a large platter and repeat with the remaining butter, batter and ricotta (the finished pancakes can be kept warm in a 300° oven while the remaining batter is cooked).