A definite MUST TRY! I made this for homemade Frisco Burgers. I used yellow onion - IMO, it has more onion flavor - chopped in half, then into quarters. Sprinkled with a bit of kosher salt, fresh ground black pepper, and EVOO. Added a couple of sprinkles of garlic powder at the end so it wouldn't burn. I only used 1 onion and added about 1/2 cup of mayo. It was plenty for us, and there is some for leftovers. I would recommend to let the flavors mingle, as the other reviewers do, with the mayo overnight, but it's also good right away. This is now our burger mayo! YUM! (My husband doesn't even like mayo, but he'll eat this.) =)

I thought this would be better. I thought it was a little bland. Not bad but I don't think I would make it again.

I also cut my onion in thick slices & made a day ahead. This was very good. I think next time I'll add garlic too-yum!

We really, really enjoyed this mayonnaise recipe! I read how Roxanne was hoping for more carmalization on her onions, so instead of just cutting them in half I cut them into thick slices and placed them on the cookie sheet with 3 cloves of garlic as well. I brushed on a little evoo and sprinkled w/ freshly ground black pepper and sea salt. Halfway through roasing, I flipped them over and everything was nice and caramel colored. I also made this a day in advance to allow the flavors to blend better. This was sooooo delicious on our mushroom swiss burgers. I will definately be making this again! Thanks for posting. :)

I love caramelized onions so I had a feeling I would love this mayonnaise. The only problem I had is the fact that my onion didn't get a nice caramel colour all over but it had that wonderful smell and was very soft by the time 30 minutes had past. Only the edges seemed to get caramelized in looks. It smelled wonderful when I processed it but I should have left it to sit before using it for the flavours to meld better. I will make again, maybe I'll cut the onion pieces smaller (so they'd have the caramelized look all over) cause I was hoping the mayo would have a nice colour from the onions. Thanks for sharing!