Gather all the ingredients.
Peel potatoes and cut into cubes. Place in a bowl of water for at least 10 minutes. Note - if using daikon, directly replace.
Make dashi stock and set aside.
Slice onion and set aside.
In a small mixing bowl, combine sweetener, Japanese cooking sake and soy sauce.
Prepare shirataki noodles by straining prepacked liquid and washing noodles under cold water. Set aside in a bowl.
After 10 minutes from step 2) strain the water from potato and set aside.
In a large stove top pot, add 1 tbsp of oil and heat pot on high. After 1 minute, add sliced onions, shirataki noodles, sliced beef. Mix well and cook for 30 seconds.
After 30 seconds, add dashi, potato cubes and soup mix from step 5). Bring to boil and once boiling, reduce to low. Cover 7/8 of the way and let it slow cook/simmer for 15 minutes.
Finely slice green onions and set aside (we sliced them at a 45 degree angle).
Once 15 minutes has passed, skim off the top scum (the brown foam) with a spoon/latte. Remove from heat and add green onions into the stove top pot. You can either server immediately, or wait anywhere from 15 minutes - 2 hours for the juices to really get infused into the ingredients. Sprinkle optional Togarashi prior to consuming.