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to extract essence by boiling; to extract flavor; to decoct
昆布をじっくり煮出して出汁を取る。
Extract the stock by slowly simmering the kelp.
茶葉を長く煮出すと苦味が強くなる。
If you boil the tea leaves too long, the bitterness becomes stronger.
干し椎茸を煮出した汁を料理に使う。
Use the broth extracted from simmering dried shiitake in cooking.