Cook the noodles according to package directions. Drain when they are done.
While the noodles cook, in a heat proof bowl large enough to fit all the noodles, combine the shallot, garlic, red pepper flakes, soy sauce, ponzu, sesame seeds and miso. No need to stir yet, just set aside.
Once you have drained the noodles, add the vegetable oil to a small saucepan and heat on medium high. Heat until the oil is forming small bubbles and is very hot. About 3 to 4 minutes.
Now, pour the hot oil into the heat proof bowl with the shallot, garlic, etc. It will bubble and pop, so be careful. Let the oil sit for a minute or until it stops bubbling.
Whisk the oil into the rest of the ingredients for the sauce until everything is fully combined and the miso has melted into the sauce.
Then add the noodles and green onions to the bowl with the sauce and toss to coat the noodles in the sauce.
Serve immediately with steamed veggies in ponzu sauce if desired!