It's not raw ginger. It was boiled to make it soft, then put in sugar water with increasing sugar concentration until the fruit's water was replaced with sugar almost entirely through osmosis.
By weight, it's only 25% ginger, the rest is sugär.
Kandiert in German, candied or glacéed in English. You sure know candied fruits as decoration for deserts. Citrus peels or cherries are common fruits for this.