Preheat oven to 400℉.
Cut the broccoli florets off the thick stems leaving about a 1" stem with the floret. If some florets are large, cut them in half so that they are all somewhat the same size. Wash and dry the florets.
Line a baking sheet with parchment paper or aluminum foil.
Huddle the broccoli florets together in the middle of the baking sheet. Drizzle the olive oil on the broccoli and toss with your fingers. Spread the florets out on the baking sheet so that there is space between each floret.
Sprinkle with salt and pepper.
Place in oven and set time for 15 minutes.
Take the broccoli out of the oven and sprinkle evenly with almonds, garlic, rosemary and red pepper flakes. Bake for 10 minutes more (the broccoli should be slightly brown on some of the edges).
Transfer the broccoli to a serving bowl. Squeeze the juice from half of a lemon and toss. Sprinkle with lemon zest and serve!