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To make the sauce, in a small bowl, whisk together the tahini, soy sauce, rice vinegar, and chilli oil. Set aside. Bring a large pan of salted water to the boil and cook the noodles according to packet instructions. Drain, rinse under cold water, and toss with a little oil to prevent sticking.
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Heat the vegetable oil in a large frying pan or wok over medium-high heat. Add the eggplant and cook for 6–8 minutes, stirring occasionally, until golden and starting to soften.
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Add the mushrooms, garlic, ginger and spring onions. Cook for another 5 minutes until the mushrooms are tender and the eggplant is soft. Toss through the baby spinach.
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Stir in the hoisin sauce and 2 tablespoons of water. Cook for 2–3 minutes until everything is sticky and glossy. Season with a little salt and pepper.
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Add the drained noodles to the pan along with the prepared sauce and toss everything together over low heat until well coated and piping hot.
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Divide the noodles between bowls. Top with chopped peanuts and an extra drizzle of chilli oil if you like.