Prepare dipping sauce - if you are using pre-made dipping sauce (which I usually do), follow the package instruction to dilute. I often add about 20% more water to avoid taking too much sodium. Later, before serving, add any remaining sauce from cooked shiitake (below). NOTE: If you are making it from scratch, combine 1 cup of cold water + 4-tbsp soy sauce + 2-tbsp mirin + 1-tbsp sugar (+ abut 2-inch square of kombu/dried kelp, if you have any) in a small sauce pan, cook for a few minutes, and let it cool. Take out kombu once the dipping sauce is cold. Cook pre-soaked dried shiitake mushroom (for 10 min.) - To soak dried shiitake, briefly wash them just to remove dirt, place them in a glass jar just large enough to fit all the pieces, and add a spoonful of sugar. Pour lukewarm water over shiitake enough to cover all the pieces, close the lid to push down all the pieces in the liquid, and let it stand for about 30 minutes, until all the pieces soften and double in size. (NOTE: I often soak them in a batch and keep the unused pieces in a fridge, which can last up to 2-3 weeks.) Slice softened shiitake in thin pieces and cook for about 10 minutes in a small sauce pan with 2-3 tablespoons of pre-soak water + 1/4 cup of diluted dipping sauce (below). Cook for about 10 minutes and let them cool in the pan. After fishing out shiitake to a plate, add remaining sauce to the dipping sauce.
Cook eggs in thin layers - mix eggs, 2 tsp mirin and 1/8 teaspoon of salt. Heat a small non-stick frying pan medium high, once the pan is hot, drop and spread sesame oil with a brush or paper towel (keep it for 2nd and 3rd pieces), dollop 1/3 of the egg mix and swirl the pan to form a relatively even, thin layer. Wait for about 1 minute until the egg is almost cooked and transfer it to a cutting board. Using the saved brush or paper towel to lightly grease the pan and make 2nd and 3rd pieces. Let it cool and slice them in thin pieces.
Cook chicken thighs - sprinkle salt, red pepper flakes, and sake and bake in an oven at 400F for 8 minutes, turn and bake for another 7 minutes. Let it cool and slice in thin pieces.
Slice raw red/orange/green fruits & vegetables in thin pieces. This time I used nectarine and apricots because I had them at hand. I often use orange and red bell peppers and cucumbers.
Wash sugar snap peas and remove strings.
Wash broccolini well (there may be some bugs so wash at least twice).
Prepare toppings condiments - grate ginger (or you can use ginger paste in a tube). Chop green onion in thin pieces. Briefly toast sesame seeds and use them as is or use a mortar to grind less than 1/2 way (I use an old Japanese mortar with ridges called "suribachi" but that's not necessary).
Blanch peas and broccolini and cook noodle - Bring 8 cups of water to a boil. Keep the flame medium-high. Throw in sugar snap peas and immediately fish them out. When the water returns to a boil, throw in broccolini and fish out immediately. When the water returns to a boil again, throw in noodles, wait until the water returns to a vigorous boil, and throw in 1-1/2 cups of cold water. When it returns to a vigorous boil again, turn off the heat and let it sit for about 2 minutes before draining. The total noodle boiling time is about 6-7 minutes, depending on your preference and how much buckwheat v wheat flours the noodle contains. After you drain the noodles, rinse quickly under a cold water.
Arrange the ingredients in groups - noodle + dipping sauce + protein/vegetables/shiitake +toppings. This time, I used multiple small plates, and you can combine them in a larger plate like this example.