Trim ends off the broccolini. Slice the larger stalks so everything is similar in size.
Add 1/2 cup of water to a large pan and set the broccolini in the pan. Cover and place on high heat. Steam the broccolini until the water is gone.
Remove the broccolini and sop up any residual water with a paper towel.
Add butter to the same pan and melt just under medium heat.
Add minced garlic and lemon juice to the pan and cook for a couple minutes, stirring constantly.
Add the broccolini back to the pan. Season with salt and pepper and toss in the sauce and cook uncovered until desired tenderness is met. It should be tender but not mushy.