To rice the cauliflower: Chop a head of cauliflower into florets, place inside a food processor and pulse until the cauliflower has a rice texture. Or use frozen riced cauliflower that has been thawed.
Heat 1 tablespoon avocado or olive oil in a large skillet over medium heat. Sauté onion and garlic for 3-4 minutes until fragrant. Add the cauliflower rice and continue to sauté.
Meanwhile, make your sauce: Add cilantro, vinegar, garlic, lime, cumin, and salt to your food processor or blender. While motor is running, add 3 tablespoons avocado or olive oil. Blend until smooth.
Pour the sauce over the cauliflower rice and continue to stir until dressing is completely incorporated. Remove from heat and serve with lime wedges.