In a mixing bowl, add fennel seeds and 3 cups of water. Cover and soak the seeds for 6 hours or overnight.
In a jar, add the soaked fennel seeds with ½ cup of water and grind it into a smooth paste.
Pour the paste into a cotton cloth and sieve all the juice from it. Approximately 2 cups of juice should be obtained.
In a mixer jar, add 500 grams of mishri and cardamom seeds (only the seeds, not the outer layer). Grind it into a smooth powder.
Add the powdered sugar and cardamom to the variyali juice and mix well.
Place a bowl on the gas stove, keep the flame medium-low, and stir the syrup continuously until it is slightly thick and sticky. Do not overcook it.
Turn off the gas and let the sharbat syrup cool down.
Add a pinch of limbu na phool (citric acid) and mix well.
Store the variyali sharbat in a sterilized glass bottle for 1-2 months in the refrigerator.