Spicy Pork Fillets

Name: Spicy Pork Fillets
Ingredients: ⅓ cup (80ml) lemon juice; ⅓ cup (80ml) olive oil; 2 teaspoons chilli flakes; ½ teaspoon ground cumin; 2 teaspoons sweet paprika; 1 small brown onion, chopped; 2 teaspoons brown sugar; sea salt and cracked black pepper; 2 x 300g pork fillets, trimmed; ⅓ cup (80ml) chicken stock