Preheat a 12-inch skillet. Heat 2 Tbsp oil. Add carrots, and sprinkle with salt. Sauté 2 minutes, stirring frequently. Add asparagus and zucchini, and salt liberally again. Continue sautéeing for about 5-7 minutes, or until veggies are firm but tender. Once the vegetables look ready, move skillet off heat until it is time to combine everything.