Goulash Soup for slow cooker

1 large onion, finely chopped

1 lb / 500g braising beef

1 tsp white sugar

1 tbsp tomato purée

1 tbsp paprika

1 tbsp hot paprika

1/2 tin chopped tomatoes drained

2 carrots, thickly sliced

500 ml beef stock

1/2 tsp caraway seeds

1 red paprika sliced

1/2 lb / 250 g new potatoes, cubed...optional

After heating the stock on high for 20mins in slow cooker, i put everything straight into the slowcooker minus potatoes and cook on high for an hour then turn to low for the rest of the day...min 7hrs..30mins before serving i add the potatoes..