I brined my pork, but that is optional. If you want to go that route, its about a 1:16 ratio of salt to water. Regardless, slice the pork thin, between 1/8 - 1/4 inch thick.
Mix soy, fish, sesame, veggie, sesame, veggie, garlic and brown sugar. When well mixed, add pork and stir until well covered. Cover in plastic wrap and into the fridge. Let it marinate for at least 30 min.
Cut carrots into matchsticks.
Mix rice vinegar, sugar, water, and salt together in a non-reactive bowl. Once sugar and salt are disolved, add carrots, cover in plastic wrap and into the fridge.
Heat your wok or skillet on medium to med-high. Add oil, and when shimmering/lightly smoking add in the meat - don't crowd so do it in batches if necessary. I did it in two in my small wok. Cooking times will vary, but you should cook between 1-3 min per side. Pick a volunteer piece to be your test case if you need to sample or cut into. Move to a plate when finished. Pile it up to help with the residual heating, but does not need to stay hot.
Lightly toast your baguettes.
Let your baguettes cool slightly, then cover with kewpie mayo. Add pork, frisee, carrots and pickles.
Smash closed and enjoy!