Curried chickpea cake with tomato sambal

Name: Curried chickpea cake with tomato sambal
Ingredients: 400g can chickpeas drained; 1 tbsp medium curry powder; 1 tsp cumin seeds; 2 garlic cloves chopped; 1 lemon zested and juiced; 4 eggs; 3 tbsp milk; 2 tbsp chopped coriander; 1 red chilli deseeded and finely chopped; 1 tbsp rapeseed oil; 1 red onion finely chopped; 2 tomatoes chopped; 10cm length cucumber diced; 1 red chilli deseeded and finely chopped (optional); 3 tbsp chopped coriander plus extra leaves, to serve; ½a lemon juiced