In a bowl, mix together the almond butter, soy sauce, rice vinegar, garlic, toasted sesame oil, and sugar until smooth. Set aside.
Cook the udon according to the package instructions. Use a pair of tongs to move the udon from the cooking water to the bowl with the sauce. Don’t pour out the water yet.
Toss until the noodles are coated, thinning out with a bit of cooking water if needed. Enjoy topped with chili flakes, sesame seeds, and green onions!
