Cut the guavas into small pieces. Remove the large seeds if there are any. You can keep the small seeds. There is no need to peel the skin.
Add guavas, cilantro, ginger, green chilies, black salt, cumin powder, lime juice, and cold water to a blender.
Blend until smooth. Scrape the sides a few times while blending.
GUAVA CHUTNEY IS READY!