Select hard, unripe pears. Peel, core and slice them. Squeeze a little of the lemon juice over the slices.
Cover pears with the sugar and let them stand for several hours. Scrape and cut the ginger root into very small pieces, and add to the pears and the remaining lemon juice. Simmer over low heat until the mixture is clear and the syrup is thick.
Put the pears in sterilized jars and pour the syrup over them. Seal.