Take yellow onions and Spanish onions. They both function pretty well as all-purpose onions -- and they can often be substituted for each other -- but that doesn't mean they're exactly the same.

Simply Recipes / Photo Illustrations by Wanda Abraham / Getty Images I almost always have either white or yellow onions in my kitchen, rarely both. Which type I have on hand is influenced more by ...

Plenty of recipes call for onions but does it really matter which ones you use when it comes to white and yellow onions? We ...