A delightful sandwich featuring a savory beef and mushroom filling, topped with melted cheese, perfect for a quick and satisfying meal.
Heat a large skillet over medium-high heat and add a drizzle of oil.
Ensure the skillet is hot before adding ingredients to achieve a good sear.
Add the mushrooms, bell pepper, onion, and garlic to the skillet. Cook, stirring occasionally, until the vegetables are softened and the mushroom liquid has evaporated.
Cut the vegetables evenly to ensure they cook at the same rate.
Add the ground beef to the skillet, breaking it up with a spoon. Cook until the beef is browned and no longer pink.
Avoid overcrowding the skillet to ensure even browning of the beef.
Stir in the oregano, salt, and black pepper. Add the stewed tomatoes, tomato paste, and sugar. Bring to a boil, then reduce the heat and simmer until the mixture thickens.
Use a potato masher to gently crush the tomatoes for a smoother sauce.
Toast the kaiser rolls until golden brown.
Toasting the rolls adds a nice crunch and prevents them from becoming soggy.
Assemble the sandwich by placing the beef and mushroom mixture on the bottom half of each roll. Top with a slice of Swiss cheese and the top half of the roll.
Serve immediately to enjoy the cheese melted and the sandwich warm.