Heat oven to 220C/fan 200C/gas 7. Put the sausages, pepper and onion into a roasting tin, then roast for 20 mins.
Lower oven to 200C/fan 180C/gas 6, then tip tomatoes and stock over the sausages. Add sugar and most of the basil, season, then stir well. Roast for another 20 mins. Serve with garlic toasts, recipe below, sprinkled with the remaining basil.
Sausages will freeze for 1 month – defrost, cover and reheat in a medium oven for 20-30 mins.
Garlic and basil toasts
Cut a 400g bloomer loaf into 8 slices. Mix together 25g low-fat cream cheese, 1 tbsp butter, 2 crushed garlic cloves and 1⁄2 x 20g pack basil, roughly chopped. Lightly toast the bread on both sides, then spread one side with the herby mix and grill briefly until melted and golden.