Set a medium-sized saucepan filled with 1 inch of water over high heat, and bring the water to a boil.
Place the broccoli in a steamer basket, place inside of the saucepan (be sure the bottom of the basket does not touch the water), cover and reduce the heat to medium.
Steam the broccoli until just tender when pierced with a fork, 4 to 5 minutes.
Transfer the broccoli to a serving bowl. Add the olive oil, grate the zest of the lemon over the broccoli, sprinkle with salt and pepper, and toss to coat. Serve.