This is a great way to enjoy portobello mushrooms - as a burger. The bacon makes the mushrooms extra succulent. You don't even need a barbecue to make these.
This was really delicious. I marinated my mushrooms with sliced onions in olive oil and balsamic vinegar before putting them in the oven. I also mixed some horseradish with mayo and the flavors were great! Thanks! - 23 Jul 2008 (Review from Allrecipes USA and Canada)
My husband and I loved this recipe and will definately be making it again. I did add a thick slice of vidalia onion that I had sauteed in butter on both sides until well browned and softened. My addition made the sandwich a bit on the tall side, but delicious to eat! - 07 Mar 2006 (Review from Allrecipes USA and Canada)
These were excellent and so easy to make. A nice change of pace from regular burgers. Just watch out - the horseradish sauce is REALLY overwhelming. I would go lighter on that next time. It's hard to taste the other ingredients through that. Thanks for a great recipe, Elizabeth! - 05 May 2003 (Review from Allrecipes USA and Canada)