Trim the thick ends and remove any tough stems
Rinse the broccoli rabe thoroughly in cold water
Bring a large pot of salted water to a boil
Blanch the broccoli rabe for 1 to 3 minutes
Drain and transfer immediately to ice water if you want to stop the cooking
Heat olive oil in a skillet over medium heat
Add sliced garlic and red pepper flakes, if desired
Add the broccoli rabe and sauté for 3 to 5 minutes
Season with salt and black pepper
Add lemon juice or a splash of vinegar, if desired
Serve hot