This is something my mom used to make when I was a small child. I've never seen another recipe like it.
This is something my mom used to make when I was a small child. I've never seen another recipe like it.
Achieving stable whipped egg whites requires mechanical shearing forces and a protein stabilizer. Cream of tartar introduces acid, which lowers the pH and strengthens the protein network surrounding the trapped air bubbles. Use a copper bowl or a scrupulously clean stainless steel bowl for whipping. Any residual fat on the surface of the mixing vessel will coat the whisk and prevent the whites from achieving maximum volume. Whip the whites at a moderate speed rather than maximum velocity to create smaller, more uniform air bubbles that hold their shape under heat.
Set the oven temperature precisely to 350 degrees Fahrenheit. The initial twenty-minute bake allows the moisture in the whites to evaporate partially, setting the exterior structure while the bacon renders its remaining fat onto the surface. Add the grated cheese only during the final three minutes of baking. Adding dairy too early causes the proteins to seize and burn before the structural interior solidifies. Watch for the cheese to bubble and turn golden brown at the edges as your visual cue to remove the dish from the oven.