Heat oil in iron skillet on your portable burner or other hot pot all in one device. Add thin beef slices and 2 teaspoons of sugar (Until lightly golden brown) (A shabu shabu or hotpot type of pan works great as this is usually served and cooked at the dining room table and cooked in front of your guests)
Pour prepared Sukiyaki sauce pour over beef. Turn up your heat to high to bring to a light boil.
Add the prepared tofu, mushrooms, carrots and udon noodles first. Then add napa cabbage and green onions to the sukiyaki broth pot. Taste the broth after you add the other ingredients and reassess. If you want it sweeter, add a little more sugar. On the other hand, if you want it savorier, add more soy sauce. If it is too salty for your palate, add a little more dashi or water. The sauce flavors intensify with cooking. We like to check on it about 5-8 minutes into the cooking process. Cooking time is about 10-15 minutes.
Ladle beef and vegetables and broth over the udon noodles and serve at table. Add more of the vegetables and mushrooms a little at a time and cook to serve as people help themselves to the sukiyaki. (Purpose of cooking just a little at time is to keep the items fresh and not overcooked)
Enjoy Sukiyaki Beef Udon with family and friends around your kitchen table. If you desire, you can dip sukiyaki components into a pasteurized beaten egg. (This is the traditional method in Japan)
Eat sukiyaki with chop sticks and make sure you slurp your noodles. In Japan, slurping your noodles is a complement to the chef. (To really enjoy noodles while they are hot, one must slurp them in while take a cooling intake of breath. Go ahead and give it a try).