Place dates, jaggery and tamarind in a large pan over medium-high heat. Pour in 1 ½ cups water. Bring to a boil. Simmer for 4-5 minutes or until they turn mushy. Add ground coriander, ground cumin, ground fennel and red chili powder. Season with salt. Stir. Cook again for another 2 minutes. Remove from heat. Leave it to cool.
Once cooled, transfer the mixture into a blender. Blend until smooth. Pass it through a sieve to remove lumps. Store the chutney in a sterilized jar in the refrigerator.