Step 1

Preheat oven to 400° F. Line a rimmed sheet pan with foil for less clean up if desired. Place the cauliflower florets onto the sheet pan and dollop on the pesto. Sprinkle with salt and pepper.

Step 2

Use clean hands to toss the cauliflower around until it's coated in pesto. Spread the cauliflower into a single layer and place it on the middle rack of the oven. Roast the cauliflower for 12-15 minutes then remove from the oven. Flip the florets over with a spatula and sprinkle on the parmesan cheese. Place it back into the oven to roast for another 10-12 minutes.

Step 3

Remove the cauliflower from the oven and place it on a serving platter or in a bowl. Squeeze the lemon juice over the cauliflower. Dollop on extra pesto and sprinkle with more parmesan cheese if desired.