any thoughts on how to use up a LOT of mayonaise? i hardly ever use it, but i have a ton leftover from a catering job, and i hate to waste.

I discovered mayo as a marinade for grilled vegetables last summer -- so delicious. You can check out this recipe I posted last summer for ideas: http://food52.com/recipes/18288-grilled-bread-salad-with-broccoli-rabe-and-summer-squash

Buy a bunch of beautiful artichokes and other seasonal vegetables that need minimal cooking. Invite people you like over to your house. Cook the vegetables as simply as possible. Flavor the mayo with lemon juice and/or zest, fresh herbs, or anything lovely you have lying around. Dip the veggies in the mayo. It's a really good way to experience good produce and good homemade mayo.

This is one of those cases where I think trying to use it could be more wasteful than discarding it. If you are making food you don't like and where it will be unhealthier for the mayo on top of that, you gotta wonder...

Is it in a jar still sealed? How about a local shelter? Some will even take opened stuff if you're a caterer. Or call them, tell you're a caterer and make up a big batch of egg salad, cole slaw or tuna salad with it and bring it to them.

Russian salad (or Olivier salad) can use quite a bit of mayo. There are plenty of recipes on the web. And you can do deviled eggs.

thank you guys, these are both great!!

Here's another good use for leftover mayo. These are really delicioius sticky buns. http://food52.com/recipes/8131-robert-frost-rolls-and-bread

Use it to make a mayo chocolate cake. http://southernfood.about.com/od/chocolatecakes/r/bl01018a.htm
Uses almost a cup of mayo per cake. And it's good too.