Beat butter and mayonnaise
in a mixer
until well blended, scraping down the sides of the bowl to ensure complete mixing. Set aside.
Prepare your favorite macaroni
and cheese recipe. When finished, spread evenly into a sheet pan
or casserole dish
to a thickness of about 3/4-inch. Cover with plastic wrap
and cool in refrigerator.
Cut the chilled macaroni and cheese into squares that are slightly smaller than the diameter of your bread.
3 tablespoons butter in a heavy-bottomed pan. Add sliced onions
and cook over a medium-high heat stirring frequently until onions have caramelized. Season with salt and pepper.
Heat up BBQ sauce and add pulled pork. Allow to simmer
for 5 minutes over low heat.
Generously butter one side of each slice of bread with the butter-mayonnaise mixture. Be sure to butter to the very edges!
On unbuttered side, layer as follows: