In a large frying pan over medium heat, warm 1 tablespoon oil until hot but not smoking. Add the onion, season with salt and pepper, and cook, stirring occasionally, until softened, 4 to 5 minutes. Stir in as many chile flakes as you like and cook until fragrant, about 1 minute. Add the beef and pork, season generously with salt and pepper, and cook, stirring to break up the meat, until browned but not yet cooked through, 2 to 3 minutes. Add the lasagna noodles, marinara sauce, and 1 cup water and bring to a boil. Reduce to a simmer, gently pressing the noodles into the sauce as they start to soften. Cover and cook, gently tossing the noodles with the sauce occasionally, until the noodles are tender, 18 to 20 minutes. While the sauce and noodles cook, prepare the remaining ingredients.