Morrocan Beef

500g steak (eg: rump / chuck) - I use chuck
1 tin crushed tomato
1 tbsp tomato paste
1 onion, sliced
2 garlic cloves
3/4 cup stock
1 tbsp morrocan spice
lemon zest to taste
pinch sugar
couscous

Everything into the slow cooker except couscous and cook on low for 6 hours. 10 minutes before serving, add 3/4 cup couscous. Serve with steamed carrot and broccoli, even with turkish bread