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["Preheat oven to 350u00b0F. Using the coarse grater disk on a food processor or the largest holes on a box grater, shred potatoes. Toss with 1 tsp. salt and 1/2 tsp. pepper in a large bowl. Transfer to a clean dishtowel, gather together ends of towel, and thoroughly wring out excess liquid over the sink; Transfer potatoes to a bowl and set aside.", "Heat oil and 2 Tbsp. butter in a 10"" cast-iron skillet over medium-high until butter is melted. Add potatoes and immediately start forming into a crust by pushing potatoes flat against bottom and sides of pan with a 1/2-cup dry measuring cup. Continue cooking, pressing potatoes up sides of pan if they start shrinking, until potatoes are bound together and bottom of crust is starting to brown, about 10 minutes. Remove pan from heat and set aside.", "Meanwhile, melt remaining 1 Tbsp. butter in a small skillet over medium heat. Add shallots and saute until translucent, 5-6 minutes; set aside.", "Whisk eggs, half-and-half, mustard powder, nutmeg, remaining 1/2 teaspoon salt, and remaining 1/4 teaspoon pepper in another large bowl. Whisk in tarragon and set aside.", "Sprinkle Fontina cheese, goat cheese, and sauteed shallots evenly over bottom of crust, then pour in egg mixture. Arrange asparagus decoratively on top. Bake until quiche is set and crust is well browned, 30-35 minutes. Let cool to room temperature before cutting into wedges and serving from the pan."]
