Preheat the oven to 475 degrees Fahrenheit. Line a sheet pan with aluminum foil.
In a large bowl, whisk together the olive oil, pressed garlic, lemon juice, and red pepper flakes. Add the broccoli and toss gently until evenly coated. Arrange the broccoli, on the lined sheet pan, setting them apart slightly. Sprinkle with salt.
Roast the broccoli for 10 to 12 minutes. Remove the pan from the oven, flip the broccoli, and roast for an additional 8 to 10 minutes, or until the broccoli is evenly caramelized and fork tender.
Transfer the broccoli to a platter, toss gently with the lemonzest and top with the grated parmeseano reggiano cheese.