Questions about example sentences with, and the definition and usage of "Foundamental"

A: Fundamental = extremely important for something

Foundational = the origin of something

A: × The foundamental phylosophy of Japanese meal called "WASHOKU" is one soup,three dishes.
✓ The fundamental philosophy of Japanese meals called, "Washoku", is made up of one soup and three other dishes.

× A very simple meal which consists of rice, Miso soup and one plate of vegitables.
✓ It is a very simple meal which consists of rice, miso soup, and a plate of vegetables.

× This is a deciplined monks' meal in the morning.
✓ This is a disciplined monk's meal in the morning.

× Small meal must feed strong and calm mind.
✓ It is said that a small meal feeds a strong and calm mind.