1. Bring 4 qt. water to a boil in a large Dutch oven. Add 2 tsp. kosher salt, return to a boil, and stir in broccoli rabe. Cook 1 minute or until crisp-tender; drain. Plunge into ice water to stop cooking process; drain.
2. Cook pasta in Dutch oven according to package directions; drain, reserving 1/2 cup hot pasta water.
3. Melt butter with oil in Dutch oven over medium heat; add garlic, and sauté 1 to 2 minutes or until tender. Add red pepper and lemon zest; cook, stirring constantly, 1 minute. Stir in broccoli rabe; cook, stirring constantly, 1 minute. Stir in hot cooked pasta, reserved pasta water, Parmesan, and lemon juice; cook 1 to 2 minutes. Season with kosher salt and black pepper. Top with cheese.