Preheat the oven to 450°.  Line a large baking sheet with aluminum foil.

Rinse the cauliflower heads and remove the core and leaves.  Cut the cauliflower florets into small pieces, leaving the small florets whole and cutting the larger ones in half.  Drizzle with olive oil and sprinkle generously with salt and pepper.  Toss with your hands to ensure the olive oil coats every piece, and spread the cauliflower in a single layer.  Cook for minutes 45 to 55 minutes, tossing halfway through, until golden brown and caramelized.  You may want to drizzle a little extra olive oil over the cauliflower once you’ve turned it before returning to the oven.  Taste for seasonings before serving and adjust if necessary.