In a small bowl, combine the mayo, masago, and water. Set aside. That will be your sauce.
2
In a large pot or non-stick skillet, bring water to a boil and add your two frozen udon noodle blocks in.
3
Right when the noodles start to loosen, drain the pot using the lid as as cover.
4
Remove the udon noodles into a large pot and set aside.
5
If using meat, sear the meat lightly on medium heat with a bit of oil if preferred, and then add in your udon noodles. Turn heat to low and add in your masago mayo mixture, soy sauce, and green onions.
6
If it gets too dry, add a few tablespoons of water to the pan.
7
Toss for 1-2 minutes until udon is evenly coated with the sauce.
8
Garnish with more masago and green onions. Serve immediately.