After removing the sausages, melt butter over medium-high heat in the same pan and deglaze the pan as much as possible. Add onions and cook for 3-4 minutes coating in the pan drippings. Add garlic and cook for 1 minute or until fragant.
Add flour, rosemary, and salt and pepper. Coat the onions and garlic well. Cook the roux until lightly browned and toasted. Turn the pan down to medium-low.
Add beer and worcestershire sauce, fully deglazing the bottom of the pan by scraping the browned bits off of the bottom. Once the mixture thickens, add beef broth 1/2 cup at a time until the gravy thickened, then add more. Whisk frequently. After all broth is added return the pan to medium-high heat and bring to a boil, continuing to whisk frequently. Once boiling, remove from heat.
Assemble fries into nest like shapes and top with cheese, sausages, and gravy reserving some cheese and sausage slices for on top of the gravy.
Serve and enjoy!