Steam the whole head of broccoli for a lovely presentation, or speed the process along by breaking or cutting into bite-sized florets. Steam the broccoli until you can easily insert a knife into the center of the broccoli head (about 20 minutes) or fork into the large florets (5 to 6 minutes).
Preheat the broiler. Drain the broccoli and place it in a baking dish. Drizzle it with the oil, and sprinkle it with cheese, chile flakes and oregano. Broil the broccoli until the cheese is golden brown, 2-3 minutes. Squeeze lemon juice onto the broccoli, season with salt and pepper to taste, and serve.