Slow cooked beef curry

2 tbsp rapeseed oil

800g beef pieces, you can get these from your butcher

2 onions, thinly sliced

4 garlic cloves, minced

2-inch piece of ginger, grated

3 tbs tomato paste

500g baby potatoes

1L passata

½ tsp cayenne pepper

2 tsp garam masala

1 tsp cinnamon

2 tsp turmeric

2 tsp cumin

2 tsp salt

200ml water

200g natural yoghurt

Small bunch of fresh mint, roughly chopped

Handful of flaked almonds, lightly toasted.