To make the Jalebi batter, combine almond flour, arrowroot, and coconut milk together in a bowl. Empty the contents of the probiotic capsules into the bowl and mix well.
Loosely cover the bowl with a lid and put it in an oven with the oven light on for at least 10 hours. The oven should not be on, just the oven light.
Once the batter has fermented, add ¼ cup water to the bowl and mix well.
Heat oil in a wok or a deep, wide bottomed pot to 360°F or until a small drop of the batter sizzles and floats to the top.
While the oil is heating, add ¼ cup arrowroot flour to a plate, dip the apple slices on both sides.
Dip the apple into the fermented batter, then place into the hot oil until both sides are light golden brown. Cook 2-3 apple slices at a time. Then set aside on a paper-towel lined plate.
Dip into cooled syrup, garnish with crushed pistachios and serve.