Preheat oven to 450°F and set rack to the top.
Add all the sauce ingredients to a large mixing bowl and whisk until well combined. Add the broccoli florets and toss until each piece is coated in the sauce.
Transfer to a large parchment lined baking tray and spread evenly. Add a few grinds of fresh black pepper and bake for 10 minutes.
Remove from the oven quickly and carefully, and sprinkle on the parmesan cheese. Return to oven to bake for a final 3 to 4 minutes until the cheese has melted.
Serve, add a squeeze of lemon juice (optional) and enjoy!