Remove and discard the shells and stringy parts from the tamarind.
Soak the tamarind in boiling hot water for an hour to soften.
Pour the water and softened tamarind over a sieve and into a pot, pushing it through constantly with a spatula. Push the pulp through until there are only the seeds and sacks left.
Add brown sugar or grated piloncillo (unrefined cane sugar). You can adjust the amount of sugar to your liking!
Bring to a gentle simmer for 5-10 minutes, stirring occasionally. Then turn off the heat and add the juice of 1 lime and a pinch of salt. Mix well.
Let it cool completely before storing in a glass container. Keep in the fridge for up to 3 months.
Notes
Do not store in plastic or metal: Tamarind is very high in acidity and can possibly react with/degrade the materials, potentially affecting the syrups flavor and safety.
Shelf Life: Tamarind syrup will keep in the refrigerator for about 2-3 months. Make sure to keep it sealed tightly to prevent air from altering its flavor.
Consistency: If the syrup is too thick for your liking, you can add a little water to reach the desired consistency. For a thicker syrup, cook it a bit longer to reduce the liquid.