beet sugar
Sugar extracted from sugar beets. Common in health food contexts as a natural sweetener.
このクッキーはてんさい糖で甘みをつけています。
These cookies are sweetened with beet sugar.
甜菜 is the sugar beet plant itself; てんさい糖 is the sugar made from it.
Common mixed kanji-kana spelling.
Full kanji spelling using 甜 (sweet). Less common but still seen.
Compound of 甜菜 (てんさい, 'sugar beet') and 糖 (とう, 'sugar').