Finely dice 2 medium sized sweet onions (about 2 cups diced)
Mix in 2 cups of mayo (light is fine)
Shred 2 cups of cheese. I used swiss, but I wish I had added something sharper. I have some old Gouda in the fridge that would have been nice.
shake in a few drops of tobasco or freshly grind some pepper.
Mix this all together and put in a pie plate. Bake at 350 for around 30 minutes, or until it is all bubbly and brown on top.
Serve with sliced brown bread and crackers. This was pretty good, although I would like it to be zestier somehow.