Beef and water spinach noodles

Water spinach, known as ong choy in Cantonese, is a seductive, velvety vegetable that adds a little touch of luxury to anything it comes near. From the subtle crunch of its hollow stems to the intense sweetness of its leaves, it is one of the least boring green vegetables you’ll ever meet. Here it turns a homely bowl of beef noodles into something with real depth and character.