I like to start cooking the sweet potatoes while the veggies are in the cast iron pan cooking. To cook the sweet potato noodles, add water (enough that would cover all the noodles) and a large pinch of salt to a large pot. Bring water to a boil and add in the sweet potato noodles. Cook for about 8 minutes. You want the noodles to be al dente. Strain out the water with a colander over the sink and let the noodles sit to remove any remaining water.