loosely combine the meats until fairly evenly combined. Roll into 4 equal sized balls and set aside
heat oil in a large pan on medium high, add the meat balls and press into patties a little bigger than your buns and fry 2 minutes per side. Ideally weigh the meat down with a press or smaller pan- you want to develop lots of crust!
Remove the patties and drain most of the grease, leave a couple tea spoons. Return the pan to the heat and reduce heat to medium.
Add the mushrooms, season with salt, stir to coat and sautee for 2 minutes, then add the onions and peppers. Continue to saute for another 3-5 minutes until very fragrant
add all the tomato paste, fill the can with water to about 2/3 volume and add the water. Stir until fully combined, and desired thickness, then add the Italian seasoning, salt and pepper
Return the sausage patties to the pan, pressing into the sauce, cover and simmer on medium-low for 10 minutes
While everything simmers turn on your broiler, slice and butter your buns
place the bun heels on a baking sheet, butter both sides, add the patties to the bun heels topped liberally with sauce and veggies, top again with provolone
Broil for 90-120 seconds or until top toasts and cheese browns
Add fresh torn basil and press on the top and serve. I recommend slicing them in half for even easier eating.