Heat the oil in a wok over medium heat. Saute garlic and green chile for 30 seconds, then stir in onions and ginger. Cook until onions are brown. Add tomatoes, and cook until pasty. Stir in cauliflower, cabbage, peas, carrots and potatoes. Season with pav bhaji masala. Cover, and cook for 15 minutes, stirring occasionally. Season with salt, and stir in lemon juice.