Gather all the ingredients.
Make 1 cup of Dashi and leave on simmer.
Meanwhile, prepare Shirataki Noodles by straining prepacked liquid and soaking the noodles in cold water. Set aside in a bowl.
Thinly chop green onions and set aside.
Grate ginger and garlic with a grater and set aside.
Slice beef into 1/2 inch width and set aside.
Bring Dashi to a boil and add a pinch of salt. Once boiling, add Shirataki Noodles and cook for 1-2 minutes.
Next, add sliced beef into Dashi. Cook for 30-45 seconds. Note - this will cook the beef to be medium-rare. If you prefer well-cooked meat, cook for about 2 minutes.
Serve noodles and beef in a bowl.
In a separate bowl, combine 3 tbsp of Dashi soup with 1 tbsp of Ponzu, mix in grated ginger and garlic and pour over noodles and beef. Top with chopped green onions. Enjoy hot/warm. Note - you can adjust strengthen of soup by using more or less Ponzu.