Bring about 4 cups water to a boil in a large saucepan. Add rice noodles and cook 4-5 minutes or until tender, then drain. If you want to use a heartier veggie, add it to the boiling water in the last couple minutes of cooking.
Meanwhile, heat an 8-inch skillet over medium-high heat. Add the oil and swirl to coat the pan. Add the lamb, scallion, garlic, cumin, crushed red pepper, and salt. Use a spatula to break up the meat and work in the spices. Cook 3-5 minutes until the meat is browned. Stir in 1 teaspoon soy sauce, 1 teaspoon rice vinegar, and a pinch of sugar. Cook another 3 minutes (you should see some crispy bits in the pan). Remove the pan from the heat.
Peel the carrot and then keep peeling into wide ribbons, working on one side of the carrot at a time. Add the carrots in a single layer over the lamb in the skillet, then the spinach. Drizzle over the remaining teaspoon each of soy sauce and rice vinegar. Add the hot noodles, cover with a lid, and let sit off the heat a couple minutes until the spinach is slightly wilted, then stir everything together.