Preheat the grill to medium-high heat.
Toss the broccolini, olive oil, pinch of red pepper flakes, salt and pepper, to taste, together on a sheet tray. Place the broccolini on the hot grill and cook, while turning, until tender and slightly charred, 7 to 8 minutes. Place on a platter and add a squeeze of lemon and shaved Parmesan.
Broccolini is a cross between broccoli and Chinese broccoli. It has small florets and long thin stalks. It has a sweet flavor and tastes like a combination of broccoli and asparagus.