Often found in ramen-yas and gyoza shops, rayu is a Japanese condiment that adds heat to rich and salty dishes, like meaty broths or dumplings. This homemade chilli oil far exceeds the shop-bought kind and only takes 15 minutes to make. Rayu will keep for up to 3 months in a sterilised jar. Make sure your jars are properly sterilised by running through a dishwasher or rinsing with boiling water and drying in a very low oven.
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