Preheat the oven to 180 degrees celsius (convection) or 220 degrees for a standard oven.
Break broccoli into florets and halve any large ones. Similar sizes will help them roast evenly.
Pop broccoli on baking tray, drizzle with oil, sprinkle with minced garlic, salt and pepper, and toss to cover.
Ensuring the broccoli is all spread out, roast in the oven for 20-25 minutes. The ends should just be browning and the broccoli should be tender but crisp.
Remove from the oven and serve warm tossed with the lemon juice, lemon zest and parmesan shavings.