Ranong province is a source of high-quality cashew nuts, also known as Kayu seeds, among the Ranong people. It is an economic crop that can be grown anywhere, particularly the native species that are highly popular to plant, the Koh Phayam species. There is also an "ancient roasted kayu seed" that is peculiar to the Koh Phayam people. It is folk wisdom that makes the cashews here smell wonderful, crispy, delicious, and distinct from others.

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