Ginger juice is made from fresh ginger and is used in cooking to give a subtle ginger taste without the bite of the chopped fresh pieces. To make ginger juice, simply take a piece of fresh ginger and smash it with a kitchen mallet or the side of a cleaver or knife until most of the fibres are exposed. Then, with a garlic press or your hands, simply squeeze out the juice. The left-over ginger can be used to flavour the oil before you cook. The fresh ginger juice must be used immediately.