How to Make It
Slice onions in half then cut the halves vertically into thin slices.
Add olive oil to a saute pan over medium heat. Add onions. Cook, stirring gently, until the onions start to soften. Season with salt and pepper. Reduce heat to medium-low.
Continue to cook onions, stirring every few minutes. If they start to stick, add a splash of stock or water, and continue to stir. Cook until a deep golden brown, approximately one hour.