A good wok can transform your stir fry game. It's all down to an effect known as 'wok hei' (meaning 'wok's air' or 'wok's breath'), whereby the pan reaches a fierce heat, and then transfers it in a flash to your sliced and diced ingredients. Buy a good wok and it's 'hei' will ensure you can quickly char the outside of your meat and vegetables while keeping the crunch of a firmer middle. In other words, it will give you that characteristically delicious stir-fry taste.