cakes, biscuits, pastry
餜 centers on baked flour-based foods: cakes, biscuits, and pastry. The meanings are closely related as types of sweet or savory baked goods.
餜 combines the food radical 飠 with 果, which likely contributes the sound and possibly the idea of fruit or roundness, suggesting fruit-shaped cakes or pastries.
The food radical 飠 on the left indicates something edible, and the right side 果 (fruit) suggests round, fruit-like baked goods. Picture a tray of fruit-shaped cakes and biscuits.
For カ, imagine a cake shaped like a car: car -> カ, and the food radical 飠 turns it into a pastry car.