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thin strips; matchstick-like strips; julienned ingredient
「細切り」 has another reading with different meanings.
にんじんを細切りにして炒めた。
I cut the carrot into thin strips and stir-fried it.
細切りの野菜を春巻きに包む。
I wrap thin-cut vegetables in spring rolls.
肉を細切りにしてから醤油に漬けておく。
I cut the meat into thin strips and marinate it in soy sauce.