Bright and Zesty Broccoli

* 1 tablespoon extra-virgin olive oil
* 1 1/2 tablespoons grated orange zest
* 1/2 teaspoon red pepper flakes
* 1 head broccoli, cut into small pieces with stalks peeled
* 1/4 teaspoon sea salt
* 1/4 teaspoon freshly ground black pepper
* 2 tablespoons freshly squeezed orange juice