I requested my husband make them for me the following weekend and they were so delicious, thank you for the memories!
6 medium white potatoes (the right potato really makes the difference)
1 sweet onion
2 tbl butter
salt and pepper
2 tbl bacon fat (very important)
Slice the potatoes and onions, I used a mandolin to make it easier
Add the butter and the bacon grease to the pan, a cast iron works best
Fry the onion till just tender then add the potatoes, spreading them in a layer on the bottom of the skillet
Allow potatoes and onions to cook till golden brown and then flip to the other side and allow to continue to cook, as the onions start to caramelize you can scrape up those bits as you continue to cook the potatoes.
Cook until golden brown and a knife easily pierces the potato