Wash & clean the broccoli well. Also, dry it completely (you want it to roast, not steam). A salad spinner works great for this.
Add a spritz of non-stick coating to the baking sheet or cast iron skillet.
Add the olive oil, salt & pepper to the broccoli and mix well to combine. Pour on the baking sheet and tuck it into the preheated oven for 10 minutes. Depending on the size of your broccoli it will take 10 to 15 minutes to roast.
When roasting is complete, remove it from the oven and place it on a serving dish. While the broccoli is still hot, sprinkle with grated zest from the lemon (just the yellow part of the skin!) and finish with a squeeze of lemon. Serve additional lemon wedges on the side if desired.