Begin by soaking the tamarind and dried plums (sookhay aloo bukharay) in boiling water for 2 hours.
After soaking, transfer the mixture to a stove and add chopped ginger. Let it cook for an hour.
Once cooked, strain the mixture to remove the seeds and any coarse fibers.
Return the strained mixture to the stove and add jaggery, chaat masala, and roasted crushed cumin.
Allow the mixture to simmer, stirring occasionally, until the jaggery completely dissolves and the chutney thickens to your desired consistency.
Once the chutney reaches the desired consistency, remove it from the stove and let it cool.
Transfer the cooled chutney into a clean, airtight jar. You can choose to freeze half of it for later use.