Pork Medallions in BBQ sauce

Ingredients

• 1 pork tenderloin (about 600g), trimmed of fat
• 2 tsp vegetable oil
• flaked sea salt
• freshly ground black pepper
• ½ onion, roughly chopped
• 3 garlic cloves, roughly chopped
• 1 tbsp red wine vinegar
• 1 tbsp tomato purée
• 1 tbsp Worcestershire sauce
• 1 tbsp dark soy sauce
• juice of 1 orange
• 250ml chicken stock
• 1 tbsp maple syrup (optional)
• ½ tsp hot sauce (optional)