In a mixing bowl, add 1 cup (100 grams) of cumin seeds (jeera). Add 2 tablespoons fennel seeds, 1 tablespoon black pepper, and 3 cups of water. Mix well and soak for 5–6 hours.
Once the jeera is properly soaked, transfer the soaked mixture to a mixer jar and grind it into a smooth paste.
Pour the paste into a cotton cloth and strain out all the juice. You should get approximately 2 cups of cumin juice.
Now, in a pan, add 2 cups of sugar and 1 cup of water. Stir continuously on medium flame until the sugar dissolves completely.
Then add 2 cups of the cumin juice and mix well. Stir continuously and cook the mixture until it thickens slightly and becomes sticky enough to coat the back of a spoon.
Switch off the gas and let the mixture cool slightly.
In a separate bowl, add 4 tablespoons black salt, 4 tablespoons chaat masala, and ½ teaspoon limbu na phool (citric acid). Mix well. Add this masala mixture to the jeera sharbat syrup and mix thoroughly.
Jeera sharbat syrup is ready. Let it cool completely, then store it in a glass bottle. It stays good for up to 3 months in the refrigerator.