Beef empanadas

Ingredients

• Empanada dough:
• 280g cake flour
• pinch salt
• 120g cold butter, cubed
• 1 egg
• 60ml (¼ cup) cold water
• 5ml (1 tsp) vinegar
• Filling:
• olive oil, to fry
• 1 red onion, peeled and finely chopped
• 2 garlic cloves, peeled and crushed
• 5ml (1 tsp) ground cumin
• 1 chilli, finely chopped
• ½ green pepper, seeded and finely chopped
• 300g beef mince
• salt and freshly ground black pepper, to taste
• small handful fresh coriander, roughly chopped + extra, to serve
• 60ml (¼ cup) mozzarella, grated
• 1 egg, lightly beaten
• chimichurri sauce, to serve