In a large bowl, combine the sausage, onion, garlic, Worcestershire, ketchup, mustard, egg, and bread crumbs. Season with salt and pepper.
In a small bowl, combine the mushrooms, basil, rosemary, and cheese.
Form the sausage mixture into balls. Make a hole in the center, and stuff with mushroom-mozzarella mixture. Form the sausage into patties.
Cook the burgers in a saute pan or on the grill - either way add a little oil/spray to the pan to keep them from sticking. Add the patties and cook until browned on both sides and cooked through. If you’ve made thick patties, it’s best to cook them for 4-5 minutes per side, then finish them in a 375 degree oven until they are cooked through, 5-7 minutes more.
Serve the burgers on toasted buns slathered with garlic aioli and topped with the peppadew slices.
I always carry three kinds of hot sauce in my purse. I have a soft spot for making people their favorite dessert, especially if it's pie. My first cookbook, The Fearless Baker, is out on October 24, 2017.