These made really juicy burgers. I used vegenaise which gave the mayo a nice sweet taste. We also grilled up the onions and some tomatoes and added them to the sandwich. I wish I had a picture of my 5 year old who was wearing mushroom juice all over her face and hands. Will definitely make these again.
I really enjoy the meatiness of portabella burgers and these were good. I used red wine vinegar in place of the cider vinegar and it turned out well. Easy to make, great for BBQs.
these were so tasty! Me and the husband loved them. Will be making again, and again.
Delicious mushroom burger served on a potato bun. Loved the basil faux mayonnaise too. Thanks for posting. I also sauteed the onions in olive oil. Made for the Spring 2009 PAC event.