Preparation: Chop green onions, grate ginger, and serve on a plate.
Cook Udon Noodles: Boil plenty of water (not in the ingredients list) in a medium saucepan, add udon noodles, and cook according to the package instructions. Stir the noodles with chopsticks to separate them while cooking.
Drain the Noodles: Drain using a strainer and quickly rinse under cold running water to remove the extra starch.
Dipping Sauce: Combin mentsuyu and water in a measuring jar and pour into a serving bowl.
Serve: Place a bamboo strainer on a plate, put drained udon noodles, and serve with dipping sauce and condiments.
Notes
Udon noodle cooking time - a couple of minutes for frozen ones. 10 minutes or more for fresh and dried ones.
For mentsuyu, follow the instruction on the bottle. How much water to add depends on the product.