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Heat the oil in a wok and add all the stir-fry ingredients except for the tamari. Toss over a high heat for a min, then cover, reduce the heat and cook for 5 mins more until the chicken is tender. Toss through the tamari.
Meanwhile, cook the noodles in a pan of boiling water for 5 mins. Drain, but reserve the water. Mix the peanut butter, lime juice and zest, cumin and 3 tbsp of the water, then toss with the noodles until coated. Serve with the stir-fry.