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Drain and pat the tofu dry with kitchen paper. Cut into cubes, wrap in more kitchen paper, and place a heavy board over the top. Leave to drain for 15 mins.
Mix the cornflour, chilli flakes and ground peppercorns together in a bowl with a pinch of salt, then add the drained tofu. Toss well to coat.
Heat half the vegetable oil in a large non-stick frying pan over a high heat, and fry the tofu pieces for 5-6 mins until golden all over. Scoop out of the pan, and leave to drain on kitchen paper.
Add the remaining oil to the pan and stir-fry the spring onions and beans for 3-4 mins until tender and lightly golden. Pour a kettle of boiling water over the noodles in a sieve to loosen. Drain well, then tip into the pan. Fry for a few minutes until piping hot. Add the sesame oil and sesame seeds, and sizzle for a few seconds. Splash in the soy sauce, rice vinegar, then add the tofu. Toss well, then serve in bowls with a pinch of sesame seeds on top and more soy sauce on the side.