Yield: 6 servings.
3 tablespoons unsalted butter, softened
¼ cup extra-virgin olive oil
3 tablespoons fresh thyme leaves, finely chopped
Kosher salt and freshly ground black pepper, to taste
6 medium russet potatoes, scrubbed
2 teaspoons fresh lemon zest
Preheat oven to 450°. In a small mixing bowl, mix together butter, olive oil, thyme, salt, and pepper. Set aside.
Place a potato between the handles of 2 wooden spoons or 2 chopsticks. Slice the potato, making cuts about ⅛ inch to ¼ inch apart, and leaving ¼ inch at the bottom unsliced (the spoon handles will prevent you from slicing the potato all the way through). Repeat with the remaining potatoes.
Place the potatoes on a parchment-lined baking sheet and brush on the butter mixture, making sure to get in between all the slices. Bake 50 to 60 minutes, or until the outer edges of the potatoes are crispy brown. Sprinkle lemon zest over potatoes and serve.