Cut cauliflower into pieces, toss cauliflower and garlic cloves in melted ghee, then spread out into an even layer on a rimmed baking sheet. Season with sea salt and bake for 30 minutes.
Carefully transfer roasted cauliflower and garlic to a food processor or use a handheld immersion blender to puree ingredients. Blend in mayonnaise once the cauliflower has been pureed.