A lot of Taiwanese have a love-hate relationship with Taiwanese biandang (bento), the takeaway lunchbox that packs rice with a main dish (usually a type of meat) and small, often unappealing side dishes such as fried and preserved vegetables.
It's a convenient, quick, cheap (less than $3) and generally decent way to eat.
Biandang isn't one of the most delicious foods in Taiwan, but it's a staple for countless working parents and busy urbanites. Bento with chicken cutlets is a good biandang choice.
Found at convenience stores and major high-speed rail stations around Taiwan