Whisk together the peanut butter, tahini, soy sauce, mirin, half the sesame oil, sugar, garlic, and pepper flakes to form a thick paste. Whisk in enough of the tea to form a pourable sauce.
Boil the noodles in salted water. Drain and rinse noodles; toss in remaining sesame oil.
Pour sauce on top of noodles and toss to coat. Add cucumber and scallions and toss to distribute.
Used regular soy sauce, non-toasted sesame oil, and ramen noodles (not the flash-fried kind). Omitted the cucumber and tea - the peanut butter was quite loose so the sauce did not need to be thinned. Initially was going to double this recipe, but thought better of it after seeing how much 2lb. of noodles is. 4 servings is definitely incorrect for this recipe. After refrigerating for a day, the flavor was underwhelming. Adding additional soy sauce helped but it's still a bit flat.