The Ultra-Flavorful Way To Turn Trader Joe's Kimbap Into A New Snack - Tasting Table
Briefly

The package instructions recommend adding pieces to hot oil and pan frying for two minutes on each side. You can take that even further by either giving it an egg wash before frying or by coating in flour, followed by beaten egg and then frying until golden.
I found that the pan fry is superior to air frying for the crispy exterior, but in a pinch air frying is a good alternative (and an easy one for those without a microwave).
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