Answer:
A time when they're green. A time when they're brown. But both of these times, cause me to frown. But just in between, for a very short while. They're perfect and yellow. And cause me to smile.
What can be opened but cannot be closed?
This is a Japanese food consisting of cooked vinegared rice sushi-meshi combined with other ingredients, usually raw fish or other seafood.
Alight or in dark, my face is a leer. In a field with my brothers, you’ll find me without bother, For that autumn day is mine.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?