Fill a large skillet with 1 to 2 inches of water and bring to a boil; add broccolini and cook until bright green, 1 to 2 minutes. Transfer broccolini to a strainer and drain water from skillet.
Heat olive oil in the same skillet over medium heat. Cook and stir garlic in the hot oil until golden and fragrant, 1 to 2 minutes. Return broccolini to frying pan using tongs; cook and stir until heated through, 2 to 3 minutes. Squeeze lemon juice over broccoli and season with salt, pepper, and red pepper flakes.
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