How to Make It
Preheat oven to 400°F. Toss together potatoes, salt, several grinds black pepper, and 1 tablespoon of the oil on a rimmed baking sheet. Spread in a single layer. Bake in preheated oven until potatoes are golden and tender, 30 to 35 minutes, tossing halfway through.
While potatoes bake, toss together parsley, pistachios, garlic, and remaining 1 teaspoon oil in a bowl.
Top potatoes with pistachio-parsley crumble. Zest lemon over top. Cut lemon in half, and squeeze juice over potatoes.