Preheat the oven to 375 degrees. Line a baking pan with parchment paper.
Wash the potatoes but leave the skins on.
Roughly chop the Pancetta into small pieces.
Cut the potatoes into cubes about 1 1/2 inches. Transfer to a large bowl.
Add the olive oil, garlic, rosemary, zest, pancetta, salt and pepper.
Toss with your hands until all of the potatoes have been coated with the rest of the ingredients.
Lay them out on the baking sheet making sure they are all the same level.
Place them in the oven and bake for 40 minutes
After 40 minutes, loosely move the potatoes around on the pan to ensure even cooking.
Increase the oven to 425 degrees F and bake the potatoes for another 10 minutes.
Serve at once .