Spiced chicken with almonds

900 boned chicken, cut into finger-sized pieces 

1 tbsp coriander seeds

1 tbsp cumin seeds

2 tsp ground turmeric

pinch of cayenne pepper

2 tsp salt

1 tsp sugar

110g onions, roughly chopped

2.5cm piece of fresh ginger root, sliced

3 garlic cloves, crushed

30g blanched almonds

340g red pepper, seeded and coarsely chopped

5 tbsp sunflower oil

140ml water

2 tbsp lemon juice