Heat your skillet over medium high heat with oil in the pan until it is hot (you'll know because you'll feel heat immediately when you hold your hand a few inches above the pan), and then add the salt. Add potatoes in and leave alone for 5-8 minutes (it's really important that you leave the potatoes alone during this time-NO STIRRING!), until you can see from above that there is a brown crisp on the underside that is moving up the sides of the potatoes. At this point, flip the potatoes and add in the onions, rosemary, pepper, and bacon. Stir the potatoes every 2-3 minutes, until they are crisped up as much as you want. Serve with the rest of your breakfast and enjoy!