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Wash broccoli rabe florets and cut of bottom of the stalks, about ½ inch up.
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Bring a quart of salted water to a boil. Add broccoli rabe and return to boil. Cook for 3-4 minutes. Remove to a colander and rinse with cold water.
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In a pan, cook bacon until crispy on both sides. Reserve 1 tablespoon bacon grease in pan and set aside strips on a paper towel to remove excess grease. Crumble into bits.
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In pan with tablespoon of grease, add onions and cook until caramelized, or until light brown and limp.
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Add broccoli rabe to pan with onions and heat through. Remove to a serving dish.
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Top with crumbled bacon, pepper, and parmesan cheese.