Fried Sweet Cheese Pierogi Recipe

Name: Fried Sweet Cheese Pierogi Recipe
Ingredients: For the Filling; 1 pound Farmer's cheese; 2 tablespoons sugar, plus more to taste; 1 large egg, beaten; For the Dough; 3 cups (15 ounces) all-purpose flour; 1 teaspoon Kosher salt; 1/4 cup (4 tablespoons) cold butter, cut into 1/4-inch cubes; 2 large eggs; 1/2 cup sour cream; 2 to 4 tablespoons warm water; 1 tablespoon Kosher salt (for water); 1 quart canola, vegetable, or peanut oil; Sour cream for serving (optional); Applesauce for serving (optional); Caramelized onions for serving (optional)