I know I have used them for other things, mostly when trying a new recipe, but the one thing I have found they really make the difference in is in potato soup. Was asked by a guy at the produce counter yesterday about them and it got me to thinking. How would you describe the difference between leeks and onions? The only description that comes to mind is that the flavor of leeks seems more refined and subtle. When do you feel they are worth the extra expense?
He also asked would you use them with or instead of onions. I said instead, but again, am now wondering if there are times to use them with onions.
Also, do you ever use them raw?