Mix all slaw ingredients together in a large bowl and allow to chill until ready to use.
Pat flounder or cod portions dry with paper towel. Season with salt and pepper.
One portion at a time, dust with flour, dip and coat with beaten egg, and coat well with panko Crumbs.
Heat 4 tablespoons of vegetable oil in a large skillet over medium high heat.
Flounder fillets should sizzle when place in pan. Pan fry until golden brown on both sides, about 2-3 minutes per side.
Remove flounder from pan and wipe clean.
FOR AIR FRIED COD: Follow same breading procedure, and air fry for 375°F for 12-15 minutes.
Spread a thin layer of mayo (or butter, if you prefer) on the insides of a split Bulkie roll. Griddle over medium heat until golden brown.
To assemble – spread about a cup of Cole slaw on the bottom half of your roll and top with crispy fish fillet.
Cut sandwich in half and serve.