Put all the ingredients for the tsuyu broth in a bowl and stir. Transfer to a small tupperware container and close with a lid.
In a small pan over high heat, add oil and pork cutlet. Cook on one side for 2 minutes and flip over. Add soy sauce and cook for 1 minute, or until cooked through. Turn the heat off, transfer cutlet to a plate and let cool. Slice into bite size pieces.
Cook ramen noodles until they are al dente (soft but still yielding a crunch).
Put ramen noodles in thermal cup. This is optional but you can add about 1/2 tsp of neutral or sesame oil and toss the noodles until they are all covered so they won’t get too sticky. Top with slices of pork, shiitake mushrooms and spinach.
Slice boiled egg in half and wrap in cling wrap. Put wrapped eggs on top of spinach. Add shredded nori on top of eggs.
Wrap scallions and and ginger in cling wrap. Add to the thermal cup and close tightly with lid.
Put thermal cup and tsuyu sauce in a bag and take it to work.
Before serving, add about a cup of hot water to the thermal container.
Unwrap the ingredients and add them to the container. Stir well and eat.