SW - Slow cooked Bolognaise sauce

This one is for Alan to make while I'm at work. It's 3 and a half syns for the whole pot so less than a syn a portion.

1 medium onion, chopped
2 cloves garlic finely chopped
500g lean beef mince (or turkey. For other types you'll need to count the syns)
200g mushrooms, chopped
400g passatta (1 carton)
125ml dry cider
1 beef stock cube
1 tbsp dried oregano
1 or 2 carrots, chopped (optional)
1 or 2 sticks of celery, chopped (optional)
1 tbsp mushroom ketchup
Dash of Worcester Sauce
Salt and pepper to taste

Throw all of the above ingredients into the slow cooker. Cook on high for half an hour and then turn to low. Leave for several hours. About an hour before serving check how thick the sauce is. If it's too runny turn the heat back up again and leave the lid off. Keep an eye on it to make sure it doesn't boil dry.

Serve with lots of pasta and a green salad.