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["Grind fennel seeds in spice mill or mortar and pestle; set aside. Heat oil in a large skillet over medium. Add onion, season with salt, and cook, stirring often, until golden and soft, 8-10 minutes. Add chiles, garlic, coriander, and reserved fennel and cook, stirring, 1 minute. Add tomatoes, crushing with your hands as you go, and juices; reduce heat and gently simmer, stirring occasionally at first and more frequently as sauce thickens, until sauce is thickened and jammy, 50-60 minutes. Let cool; discard chiles. Pulse sauce in a food processor to a coarse puree.", "While tomato sauce is cooking, rinse potatoes in a colander under cold water until water runs clear. Transfer to a large pot and pour in cold water to cover by 1"". Season with salt and bring to a gentle simmer; cook until potatoes are just tender, 20-25 minutes. Drain and transfer potatoes to a kitchen towel-lined rimmed baking sheet. Chill (uncovered) until cold, about 1 hour.", "Meanwhile, whisk egg yolk, garlic, and vinegar in a small bowl to combine. Whisking constantly, gradually drizzle in grapeseed oil and continue to whisk until aioli is thickened and emulsified. Season with salt; stir in 1 tsp. water.", "Fit a large pot with thermometer and pour in vegetable oil to measure 3"". Heat over medium-high until thermometer registers 325u00b0F. Working in batches, fry potatoes until skins begin to slightly bubble around edges but do not brown, about 2 minutes. Using a slotted spoon, transfer potatoes to paper towels to drain.", "Reheat oil until thermometer registers 375u00b0F. Working in batches, refry potatoes until golden brown and very crisp, about 3 minutes per batch. Transfer to fresh paper towels to drain.", "Toss potatoes, paprika, and cumin in a large bowl; season with salt. Serve potatoes with tomato sauce and aioli.", "Tomato sauce can be made 4 days ahead; cover and chill. Bring to room temperature before serving.", "Potatoes can be blanched 1 day ahead. Let cool; cover and chill."]
