Heat the sunflower oil in a large saucepan over a medium heat until hot. Sweat the onion and garlic for 8-10 minutes, stirring frequently, until the onion is soft and translucent.
Add the ground spices and a little seasoning, stir well, and cook for a further minute. Add the peas and lemon zest, stir again, then cover with a lid and allow them to soften for 5-6 minutes. Remove form the heat and mash very lightly with a fork.
Adjust the seasoning as necessary then stir through the chopped mint. Spoon into serving pots and garnish with a sprig of mint leaves. Serve hot or cold.
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