Bring a pot of water to a boil and blanch the broccoli florets for 2 minutes, keeping the water at a steady boil. Move to a colander and drain well so the florets won’t steam on the grill.

In a large bowl, toss the drained broccoli with olive oil, minced garlic, lemon zest, lemon juice, salt, and pepper until evenly coated. The florets should look glossy with seasoning.

Preheat your grill to medium-high heat and place the broccoli on the grates in a single layer. Grill for 4-5 minutes per side until visibly charred with crisp edges and tender centers.

Transfer the charred broccoli to a serving platter and sprinkle with red pepper flakes and Parmesan cheese if desired. Serve with lemon wedges on the side if you like bright finishing flavor.