Prepare pasta according to package, drain and set aside. While pasta is cooking slice your sausage into 1/2" pieces and cook over medium high until browned. Remove from pan until later.
In the same pan heat butter over medium heat, add onions and cook until translucent. Add garlic and cook for 1 minute until fragrant.
Add broccoli to the onion mixture and sautee for 2-3 minutes. Add broth and lemon juice and cover for 5 minutes.
Add broccoli and onion mixture along with sausage to your pot of pasta, toss to coat. Add lemon zest and season with salt and pepper to taste. Sprinkle with green onions and enjoy!