Mexican Pork Rolls

Bahan-bahan (4 porsi)

• 1 1/2 cups shredded Pork Carnitas ((Mexican Pulled Pork))
• 1/2 cup Enchilada Sauce ((preferably homemade - here is my Easy Classic Enchilada Sauce))
• 1 1/2 tbsp butter
• 2 brown onions (, halved and finely sliced)
• 1 1/2 tbsp brown sugar
• 1 tbsp balsamic vinegar
• 1/2 tsp salt
• Black pepper
• 1/2 cup grated mozzarella cheese ((or any other good melting cheese))
• 4 soft white bread rolls
• Fresh parsley (, finely chopped, for garnish (optional))