What happens to the natural sugars in vegetables when prepared using *gui* techniques?

Answer

They caramelize, creating pockets of sweetness

When vegetables like mushrooms, onions, or sweet potatoes are placed on the grill or in a pan, their natural sugars caramelize, providing a sweet contrast to savory meats.

What happens to the natural sugars in vegetables when prepared using *gui* techniques?
cookingKoreanroastgrill