Easy
I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.
Easy
A young man wants to have it, but when he has it he no longer wants it. Blade in hand he attacks it And does his best to remove it. Yet he knows that it is all in vain.
Easy
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty