Preheat a large nonstick pan over medium heat and add oil. Add the green onion and sauté for 4-5 minutes, then stir in the cauliflower with 2 tablespoons of water, lime juice, salt, pepper, and lime zest.
Cook for 10 minutes over medium heat, stirring occasionally. Add in cilantro and cook for additional 3-4 minutes, until cauliflower is tender. Serve warm or chilled.