"Create a hearty one-pan sausage and potato stew using these ingredients: 1.2 kg potatoes, 800 g salsiccia sausage meat, 2 tbsp olive oil, 2 onions, 3 carrots, 2 red peppers, 4 garlic cloves, 2 tbsp tomato purée, 400 g chopped tomatoes, 250 ml chicken stock, 1 tsp smoked paprika, 1 tsp dried thyme, 1 bay leaf, 1 tsp ground fennel seeds, 1/2 tsp chilli flakes optional, 1 tsp salt plus more to taste, 1/2 tsp black pepper, and 150 g frozen peas. Use metric units, and make it a complete recipe with clear steps and sensible seasoning guidance."