Step 1

Cook the udon noodles according to the package directions.  Then drain the water and rinse the noodles to remove any extra starch.  Put the noodles in a bowl of ice water to chill.

Step 2

Mix the onion, ginger, yuzu miso, soy sauce, mirin, and maple syrup together in a small saucepan.  Heat the sauce over medium heat.  Just as the sauce beings to boil, reduce the heat to maintain a simmer and let the sauce cook for 4 minutes, stirring occasionally.

Step 3

Drain the noodles completely and divide them between two plates/bowls.  Top the noodles with cucumber matchsticks, then spoon the miso sauce over the top.  Garnish with toasted white sesame seeds, if desired.  Serve immediately.