Cook Like a Chef: Argentinian empanadas

Name: Cook Like a Chef: Argentinian empanadas
Ingredients: 2 tbsp vegetable oil; 400g beef mince : 5% fat; 1 onion, finely diced; 2 cloves garlic, crushed; 100g button mushrooms, diced; 1 red pepper, diced; 3 tbsp green olives, diced; 1 tsp chilli flakes; 1 tsp smoked paprika; 1 tsp ground black pepper; 2 tbsp tomato puree; 500ml beef stock; 50ml Worcestershire sauce; 1 tsp Dijon mustard; 100g grated cheddar cheese; 2 sheets ready-made puff pastry; 2 eggs mixed with 50ml milk for eggwash; Handful parsley; Handful fresh coriander; 1 cloves garlic; 1 tsp dried chilli flakes; 100ml olive oil; Zest and juice of half a lemon; Salt and pepper