白糖 is white sugar (白 is white and 糖 is sugar), and 糕 is cake, so 白糖糕 is white sugar cake.
About This Dish
This spongy cake is made from rice flour and sugar, fermented then steamed. Also known as steamed rice cake, white sugar sponge cake, fermented rice cake, or white honeycomb cake because of the air gaps within the cake.