Remove leaves from cauliflower; trim stem flush with base so it will sit flat. Set aside.
Add oil, lemon juice, Parmesan, parsley, garlic, and salt to a medium bowl; whisk to combine. Reserve 2 Tbsp. of oil mixture in a separate container; set aside.
Place cauliflower, stem-side up, in a large, oven-safe pot with a lid. Drizzle remaining oil mixture into openings where leaves were removed; baste all over the outside. Turn cauliflower stem-side down; evenly baste top. Cover; cook for 40 to 45 minutes, or until cauliflower begins to become tender.
Move cauliflower to a baking sheet; increase oven temperature to highest temperature. Bake an additional 10 to 15 minutes, or until cauliflower is golden brown and tender-crisp.
Remove from oven; baste with reserved dressing before serving.
Cut into six equal portions and enjoy!
Notes
If you don’t have a pot that will work for this, you can wrap the cauliflower in aluminum foil instead. Just be sure to place it on a baking sheet to catch any leaking oil.
If you don’t get the timing just right, and the cauliflower is browned before it’s tender, turn the oven down to 350° F and roast until done.
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