Sweet and Salty Mashed Potatoes

Deselect All

1 pound Yukon gold potatoes, peeled and cut into small pieces

1 pound sweet potatoes, peeled and cut into large pieces 

Kosher salt

1 stick (8 tablespoons) unsalted butter, at room temperature 

1/2 cup heavy cream, at room temperature 

1 vanilla bean, split and seeds scraped out 

1/2 teaspoon lemon zest (from about 1 lemon) 

3 tablespoons grapeseed oil

6 slices prosciutto, thinly sliced crosswise into julienne strips