Warm a teaspoon of canola oil in a skillet over medium-high heat. Add the pork and cook for 5 minutes, stirring frequently to break the pork into tiny crumbles. Cook for another 3 to 5 minutes, stirring less frequently, until the pork turns deeply golden and crispy. Set aside.
While the pork is cooking, set the noodles in a bowl and cover them with hot water to soak. Let them sit until softened, about 10 minutes or until the pork has finished cooking.
Bring a pot of water to a boil. Drop in the noodles and cook for 1 to 2 minutes, until the noodles are stretchy and tender. Drain and rinse under cool water. Use a pair of kitchen shears to cut the mass of noodles 3 or 4 times — this makes the long noodles easier to eat.
Combine the noodles, pork, green onions, cilantro, chili, and peanuts in a large bowl. Whisk together the soy sauce, fish sauce, sugar, and lime juice in a small bowl. Taste and add more of any of the ingredients if necessary, then pour the sauce over the noodles.
Use tongs or clean hands to lift the noodles, fold them over, and gradually work the ingredients into the noodles. Let stand at least 15 minutes before serving or refrigerate until serving. Garnish each dish with extra peanuts.
This dish is best on the day that it is made. For serving leftovers, make an extra batch of the sauce and add it to the noodles a few teaspoons a time, stirring the noodles until they loosen and become slippery again.