Pan Fried Pierogi with Cabbage and Apples - ioanacooks

Ingredients

• 1 batch homemade pierogi or store-bought
• 2 tablespoons unsalted butter
• 1 medium sweet onion, thinly sliced
• 1 large apple, cut into 1/2 inch slices
• 10 ounces shredded green cabbage
• 1 tablespoon white balsamic vinegar
• 1 teaspoon granulated sugar
• 1/2 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• Sour cream, for serving (optional)