Chop the onions & the thin slices of Italian bacon. Start frying for about 5 min in some olive oil. Add pressed garlic (optional). Add salt & pepper to taste. Transfer everything into the slow cooker.
Chop the carrots & the mushrooms (optional) & put into the slow cooker.
Cut the beef into pieces of about 3-4 cm & fry until slightly brown allover (in the same frying pan w/o cleaning). Transfer the fried beef into the slow cooker.
Mix tomato purée w/ thyme, sweet paprika & sugar & pour into the slow cooker.
Pour the beef stock & the red wine in the slow cooker.
Add bay leaves.
Start the slow cooker on high temperature for 4 - 5 hours.
Discard bay leaves.
Add salt & pepper to taste.
If you like a smooth sauce just fish the beef out of the slow cooker. With a hand blender purée all the rest (liquids, vegetables ...) until smooth. (For this version I used no mushrooms, but more carrots.) Don't forget the final seasoning!
Serve w/ roast potatoes, mashed potatoes, pasta, rice or just fresh baguette.