Step 1

Place the sliced red onion, cubed sweet potato and chipolata sausages in your slow cooker.

Step 2

In a bowl or jug, mix together chopped tomatoes, red pesto, beef stock, sugar, thyme, salt and pepper, and pour it over the sausages (there's no need to brown them first).

Step 3

Cook the casserole on low for 7 hours or high for You may want to stir through some thickening granules (or whisk in a cornflour slurry) at the end of cooking, to thicken the sauce.