White miso is one of those ingredients most home cooks own but only use for one recipe. That's a waste. It's the single fastest way to add fermented umami depth to noodle sauces, glazes, and marinades, and it transforms a decent pork and soy dish into something that tastes like it simmered for hours.
The technique that matters is blooming. Miso works best when it gets a quick fry in hot fat before any liquid touches it. Twenty or thirty seconds in the residual pork fat, and the flavor changes. It loses its raw, pasty edge. It gets toasted, deeper, nuttier. This is the exact same principle as blooming tomato paste in olive oil for a red sauce, and it's just as essential.
Brown the pork first. Dry pan, single layer, no oil. Let it sit untouched for two or three minutes until the bottom is deeply caramelized. Break into chunks, cook another few minutes for more crispy edges, then pull. Leave the rendered fat in the pan.
Garlic for twenty seconds. Miso gets dropped directly into the fat and fried until it darkens and smells toasty. Then chili crisp, soy, sugar, and chicken stock. Stir until the miso fully dissolves and the sauce is smooth. At this point the pan should be dark, glossy, and intensely savory.
Egg noodles go directly into the sauce. Toss continuously as they absorb the liquid, 3 to 5 minutes, until the sauce has tightened and the noodles are dark and clingy. Pork back in, scallions, sesame seeds, a heavy drizzle of chili crisp on top. This is the one you'll make again next week.