Grind the cashews until they form a powder but do not over blend or they will start releasing oil and become lumpy. The final powder will be a little grainy.
200 grams unsalted cashews
Make a sugar syrup: Add the sugar and water in a saucepan and bring it to a boil. Do not stir the sugar or it may crystalize. Once the sugar is dissolved, reduce the heat to medium-low and add the cashew powder.
90 ml water, 150 grams white granulated sugar
Keep mixing so the cashew powder does not form any lumps and continue cooking for 2-3 minutes until the mixture thickens a little.
Add the rose water, cardamom powder, and ghee to the mixture and continue cooking on low heat until the mixture thickens and releases from the sides of the pan, about 5-6 minutes. Make sure not to overcook the mixture or the fudge will become too hard. The mixture should still be a little runny. If it's not, add a little more ghee. Do not leave the mixture unattended during this step, keep mixing to make sure it does not burn from the bottom.
1 tsp rose water, 1/2 tsp cardamom powder, 2 tsp ghee
Pour the prepared fudge onto a sheet of baking paper, top it with another layer of baking paper, and let it cool down for 2 minutes, then knead the mixture using your hands until it becomes smooth and like a dough. The mixture will be very hot so be careful and use gloves if you can.
Quickly roll the dough between two sheets of parchment paper before it sets, then let it chill at room temperature until it's completely set.
Cut a circle out of the fudge that's slightly smaller than your tart, then place it inside the prepared tart.