Tangerine beef

By Michel Roux Jr. From Saturday Kitchen Ingredients For the beef and marinade 100ml/3½fl oz light soy sauce 100ml/3½fl oz sherry 100ml/3½fl oz tangerine juice 2 garlic cloves, finely chopped 1 tbsp sesame oil 1 tsp chilli flakes 600g/1lb 5oz flank steak 100g/3½oz cornflour For the sauce 2 …