Preheat the oven to 375 degrees F. Grease a 9x13 casserole dish and set aside.
Over medium-high heat in a non-stick skillet, cook the ground pork until no longer pink. Season it with the garlic powder, oregano, basil, salt and red pepper flakes.
Stir in the marinara sauce until well combined. Stir in the lemon juice and remove from heat.
In the prepared casserole dish, make two layers: half the ravioli, half the sauce, half the Parmesan and half the mozzarella cheese - and repeat.
Cover the dish with foil and bake for 45 minutes.
Uncover the lasagna and discard the foil. Increase the oven temperature to 425 degrees F. Bake for an additional 15 minutes, until the cheese on top is browned and bubbly.