01 -
In a large skillet set over medium heat, cook the ground beef until fully browned, about 5 to 7 minutes, breaking into crumbles as it cooks. Drain off excess fat.
02 -
Adjust heat to low and stir in 1 cup of marinara sauce. Simmer for 2 to 3 minutes until the mixture is fully heated through, then remove from heat and set aside.
03 -
In a medium bowl, thoroughly combine ricotta cheese, parmesan cheese, and Italian seasoning until smooth.
04 -
Spread about 1/2 tablespoon softened butter evenly on one side of each sourdough bread slice.
05 -
On the unbuttered side of a bread slice, spread about 2 tablespoons of ricotta mixture, then top with approximately 1/3 cup beef-marinara mixture and 1/4 cup shredded mozzarella. Repeat for three more sandwiches.
06 -
Place a second bread slice on each assembled sandwich, ensuring the buttered side faces outward.
07 -
Heat a large skillet over medium. Working in batches, cook sandwiches for 3 to 4 minutes per side until golden brown and cheese is melted.
08 -
Serve sandwiches immediately, with remaining marinara sauce provided for dipping.