01 - Set oven to 350°F.
02 - Boil ramen noodles for 2 minutes less than package instructions. Drain thoroughly and set aside.
03 - Warm vegetable oil in a large skillet over medium heat. Add onion, garlic, and ginger; cook until fragrant and translucent, about 3 minutes.
04 - Add ground pork to the skillet. Break up the meat with a spatula and cook until browned.
05 - Stir in gochujang, red pepper flakes, crushed tomatoes, soy sauce, rice vinegar, and sugar. Season with salt and pepper. Simmer for 10 minutes, stirring occasionally, until slightly thickened.
06 - In a mixing bowl, combine ricotta cheese, egg, half of the mozzarella, and half of the parmesan. Mix until uniform.
07 - Spread a thin layer of meat sauce in the bottom of a 9x13-inch baking dish. Arrange approximately one pack of ramen noodles over the sauce.
08 - Distribute one-third of the cheese mixture over the noodles. Spoon one-third of the meat sauce over the cheese. Repeat the layering process two more times, finishing with the remaining meat sauce.
09 - Sprinkle remaining mozzarella and parmesan evenly over the surface.
10 - Cover dish securely with aluminum foil and bake for 20 minutes. Remove foil and continue baking for 10 to 15 minutes, until cheese is bubbling and golden.
11 - Allow lasagna to rest for 10 minutes before slicing. Garnish with sliced green onions if desired.