Pour water in a pot and add in thinly sliced onions. Turn on heat to high
Once water comes to boil and onions cook down (about 5 minutes), lower heat and add in thinly sliced beef
Then add in curry roux and mentsuyu. Makes sure the roux breaks down and disintegrates into water
Add frozen udon and cook until udon is done
Add toppings such as grated garlic and egg
Cover and cook the egg for a few minutes until done to likeness
Serve hot and enjoy!