01 -
Bring a large pot of salted water to a boil. Cook pasta until al dente, about 1-2 minutes less than package instructions. Reserve ½ cup pasta water, then drain.
02 -
In a bowl, whisk together milk, cornstarch, gochujang, soy sauce, sugar (if using), and black pepper until well combined. Set aside.
03 -
Heat butter (or oil) in a large pan over medium heat. Add diced onion and cook for 3-4 minutes, until soft and translucent.
04 -
Stir in minced garlic and cook for 30-45 seconds, just until fragrant but not browned.
05 -
Pour the gochujang milk mixture into the pan. Bring to a gentle simmer, stirring constantly, and cook for 2-3 minutes until the sauce thickens and becomes creamy.
06 -
Add cooked pasta to the sauce and toss until evenly coated. If the sauce is too thick, add splashes of reserved pasta water until silky. Serve immediately topped with green onions, sesame seeds, or parmesan if desired.