01 - Preheat oven to 350°F and position rack in center.
02 - Boil ramen noodles for 2 minutes less than package instructions, then drain and set aside.
03 - Heat vegetable oil in a large skillet over medium heat. Sauté onion, garlic, and ginger until aromatic and translucent, approximately 3 minutes.
04 - Add ground pork and cook until fully browned, breaking up into small pieces with a spoon.
05 - Incorporate gochujang, red pepper flakes, crushed tomatoes, soy sauce, rice vinegar, and sugar. Season with salt and pepper, then simmer for 10 minutes until slightly thickened.
06 - Combine ricotta cheese, egg, half of the mozzarella, and half of the parmesan in a bowl until smooth.
07 - Spread a thin layer of meat sauce at the base of a 9x13-inch baking dish.
08 - Arrange a layer of ramen noodles on top, using approximately one package per layer to fit evenly.
09 - Spread one third of the ricotta mixture over noodles, top with one third of the meat sauce. Repeat layering twice, finishing with the remaining meat sauce.
10 - Scatter remaining mozzarella and parmesan evenly across the top.
11 - Cover dish tightly with aluminum foil and bake for 20 minutes.
12 - Remove foil and bake an additional 10–15 minutes until cheese is bubbling and lightly golden.
13 - Allow lasagna to stand for 10 minutes before slicing; garnish with green onions if desired.