Method
Heat oil in casserole dish & brown sausages.
Remove the sausages from the pan and add onions & fry until soft. Add garlic & rosemary & cook for 1 min.
Add wine & tomato puree & reduce the liquid.
Add tomatoes, stock, marmite & mushrooms, bring to the boil.
Add browned sausages, cover & simmer for 1 hour.
Tips
You could try adding other veg to this I think Red Pepper & Celery would work well, but I didn’t have any in.