sugar, sugared, candy, crystallized sweetmeats
餹 centers on sweetened foods, especially sugar-based treats: sugar, candy, and crystallized sweetmeats. The sugared sense extends naturally to anything coated or preserved with sugar.
餹 combines the food radical 飠 with 唐, which likely contributes the sound トウ and may relate to the idea of sweetness or sugar. The exact historical development is uncertain.
The food radical 飠 on the left suggests something edible, and 唐 on the right looks like a container with a lid and a sweet inside. Imagine opening a jar of crystallized sugar candy.
For トウ, picture a toe-shaped candy: toe -> トウ, and the food radical reminds you it's a sweet treat.