2. Step
Combine lime juice, chipotles to taste, honey, garlic and salt in a blender. Process until mostly smooth. Place cauliflower in a large bowl; add the sauce and stir to coat. Transfer to the prepared baking sheet. Sprinkle onion over the cauliflower. Roast, stirring once, until the cauliflower is tender and browned in spots, 18 to 20 minutes; set aside to cool.