There are two types of frozen Udon noodles, one is made by rapidly freezing fresh Udon noodles soon after they are boiled, and the other is made by rapidly freezing the fresh Udon noodles without boiling.
生うどんを熱湯で茹でた直後、急速冷凍したもの、及び、生うどんを茹でずに急速冷凍したもの。