Heat the oil in a wide saucepan and fry the onion and sausages over a medium heat for about 5 minutes, stirring until the onions are soft and the sausages are browned all over.
Add the garlic, cook briefly, then add the vegetables, tomatoes, stock and thyme and bring to the boil. Simmer over a gentle heat for 20-25 minutes until the sausages are cooked through.
Season with black pepper and serve with mashed potato or pasta.
Freezing and defrosting guidelines
Once the dish has cooled completely, transfer it to an airtight, freezer-safe container, seal and freeze for up to 1-3 months. To serve, defrost thoroughly in the fridge overnight before reheating. Loosely cover with foil and bake until dish is thoroughly heated through. Reheat until piping hot.
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For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.