Heat sesame oil in a skillet over medium heat. Stir in onion, snow peas, asparagus, and carrot. Cook, stirring occasionally, until tender, about 5 minutes.
Increase heat to medium-high. Add grated cauliflower, bean sprouts, scallions, and chicken bouillon. Cook until heated through, about 6 minutes. Stir in parsley and rice wine vinegar.