Step 1

Heat water over medium-high heat until just boiling. Add in tamarind concentrate and stir until completely incorporated. Add jaggery, salt, cayenne, cumin, and ginger. Stir until sugar and salt are completely dissolved.

Step 2

Reduce heat to a simmer and cook until thickened to a point that it's slightly syrupy, about 20 minutes, stirring occasionally. Let cool for 10 minutes. Use immediately or transfer to an airtight container and store in refrigerator for up to 1 month.