1. Cut the potatoes into 1/8" x 1/8" strips I used a mandolin. Add the sliced onion, and spices, then mix it up with your hand.
2. Melt the butter in a Teflon pan over low heat, then add the oil. Add the potato mixture to the pan, being sure that it's not more than about 1 1/3" thick. Cover and cook on low for 15 minutes.
3. Flip them over, by placing a plate on top, then flipping. Slide the potatoes back into the pot so the other side can cook. Cover, and cook another 15 minutes.
4. To serve: You can either slide the whole thing onto a plate, or cut in wedges right in the pan.