From Ali Slagle's new book: I Dream of Dinner Notes: You only need 1/2 cup of grated potato, so if you are shopping, look for small potatoes. Even a 3-oz potato will give you more potato than you need for this recipe. The key to success here is to not use more than 1/4 cup of lightly packed grated potato per taco — it will be tempting to use more. Try to refrain. I'm using these red hatch chile tortillas from The Fresh Chile Company, which one of you — thanks, Larry! — introduced me to. The green sauce you see in the photos is a garlic scape pesto my friend Courtney gave me.