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To make the sauce, tip half the beans into the bowl of a food processor with the rest of the ingredients and 50ml water. Season, then blend until smooth. Pour into a small saucepan and heat gently for about 5 mins or until thick and glossy.
In a large dish or bowl, toss the pork pieces in the cornflour and set aside. Heat your wok to a high temperature, add a little oil, then the pork – you might need to do this in batches. Stir-fry for around 5 mins until golden brown and cooked through. Remove the pork from the wok using a slotted spoon and leave to rest on a plate.
If the wok is dry at this stage, add 1 tsp vegetable oil. Add the shallots and stir-fry until soft. Throw in the chopped radishes, the rest of the beans and the pak choi and spring onion. Cook for 3-4 mins, then return the pork to the pan, stir in the sauce and bring to the boil for 1 min. Serve with cooked rice and a few more sliced (or carved, if you’re feeling fancy - see tip) raw radishes.