Piquant pork casserole - Porc Blasus

Ingredients

• 450g lean pork shoulder or leg, diced
• 1 medium leek, sliced
• 2 celery sticks, sliced
• 1 garlic clove, crushed
• 1 tbsp tomato purée
• 1 tbsp Worcestershire sauce
• 300ml orange juice
• 1 tbsp paprika
• 1 tbsp English mustard