Gather all ingredients before starting the recipe.

• Preheat oven to 400℉
• Slice 1 whole lemon into thin slices. Crush 3 cloves garlic with the flat blade on a knife, then finely chop the garlic.
• Separate 1 bunch broccolini into stems and rinse under cold running water. Transfer to an aluminum lined baking sheet and spread out evenly. Season with kosher salt and freshly ground black pepper.
• Tuck lemon slices in between the broccolini and sprinkle with the chopped garlic, add a drizzle of olive oil and toss to combine.
  
• Transfer to a preheated oven and roast for 15-20 minutes, or until the broccolini is firm tender and the lemon slices have softened.