Classic chicken curry

3 tablespoons curry paste, such as Patak's® Rogan Josh

1 teaspoon ground cumin

1 teaspoon ground coriander

1 teaspoon garam masala

2 medium onions, sliced

1 red chilli, deseeded and sliced

1 green pepper, sliced

2 cloves garlic, chopped

400g mini chicken fillets, chopped into chunks

1 tin chopped tomatoes

1/2 cauliflower, broken into florets

1 large handful green beans, washed and cut in half

2 medium potatoes, peeled and roughly chopped

salt and pepper

water