Answer:
It's a symbol and a fruit, For man's folly, evil's root. But also for great inspiration, and famous application.
I'm very tempting, so it's said, I have a shiny coat of red, and my flesh is white beneath. I smell so sweet, taste good to eat, and help to guard your teeth.
I'm a food made of flour, water, and yeast or another leavening agent, mixed together and baked. You need me to make a sandwich.
What stinks when living and smells good when dead?
The leaves are on the fruit, the fruit is on the leaves. What is it?
It rows quickly with four oars but never comes out from under his own roof. What is it?