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Start with the XO sauce. Heat the oil in a small frying pan over a medium heat. Add the red onion, chopped chillies and garlic and a pinch of salt and fry, stirring occasionally, for 15 minutes, until everything is glossy and completely soft. Stir in the dried chilli flakes and smoked paprika and remove from the heat. Add the remaining sauce ingredients and stir well to combine. Reserve 4 tablespoons of the XO sauce for the tofu. The rest of the sauce will keep well in a jar in the fridge for up to 3 weeks