Campfire stew

Name: Campfire stew
Ingredients: 600g gammon; 1 tbsp vegetable oil; 2 onions, roughly chopped; 2 carrots, chopped; 1 celery stick, chopped; 2 peppers, deseeded and chopped; 3 garlic cloves, crushed; 1 tbsp tomato purée; 2 tsp smoked paprika; ½ tsp chilli powder (optional); 2 x 400g cans chopped tomatoes; 1 tbsp Worcestershire sauce; 2 bay leaves; 2 x 400g cans haricot beans, drained and rinsed