Lamb Tagine with a twist

My flatmate has a slowcooker, and I had some lamb I wanted to use - the perfect combination for lamb tagine. I got a little playful with the ingredients and spices based on what was lying around, but the flavour came out amazing - have posted it below at S's urging. It's really the easiest thing, it just requires some assembly.

Ingredients
1 tbsp oil
600g lamb, de-boned and cut into 2-3cm squares
2 white onions
1 tablespoon fresh ginger, peeled and chopped
3 garlic cloves, peeled and diced
500g passata
3 small carrots, cut into coins 1cm thick
2 sweet potatoes, peeled and diced
20g woodear mushrooms
50g dried fruit (I used goji berries and sultanas because that's what I had lying around)
1 cinnamon stick
3 cardamon pods
1/2 tsp coriander seeds
1/4 tsp cumin seeds
1/2 tsp ground cumin
1/2 tsp ground turmeric
1/4 tsp chinese 5 spice
1/2 tsp ground coriander
1/2 tsp paprika
1 tsp salt
1 tsp white pepper
1 tbsp honey
2 tsp lemon juice

Saute onions, garlic, ginger and lamb in a pan until meat is browned. Add to slow cooker with the rest of the ingredients. Cook on low heat for at least 8 hours. Serve with couscous studded with flaked almonds, scallions and sultanas. (I did say it was easy!)