Sausage white bean casserole

Name: Sausage & white bean casserole
Ingredients: 1 red or yellow pepper deseeded and cut into chunks; 2 carrots cut into thick slices; 2 red onions cut into wedges; 8 chipolatas cut into thirds; 400g can peeled cherry tomatoes; 400g can white beans drained; 200ml low-salt chicken stock; 2 tsp Dijon mustard; 100g frozen peas; potatoes pasta or rice, to serve