Cut the potatoes (no need to peel) into 1-2 inch chunks. Cut the florets from the cauliflower. Put both into a large oven proof dish.
Sprinkle the spices plus a teaspoon of salt over the potatoes and cauliflower. Drizzle over two tablespoons of the oil, stir, then put in the oven for an hour until the potatoes are cooked through.
Put the remaining oil in a large saucepan over a medium heat. Add the curry leaves. Let them sizzle for 30 seconds, then add the cauliflower and potatoes. Stir. Add up to 300ml water if the mix is very dry.
Add the frozen peas and simmer for 4 minutes. Stir in the chopped coriander, then serve.
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Notes
This curry can be made in advance. Store in the fridge for up to a week, or in the freezer for up to a month. Reheat thoroughly before serving.