Prepare the masala chai tea and keep aside. My recipe is already linked in the ingredients section of this recipe card.
Prepare the mascarpone filling. In a large mixing bowl, add heavy cream, powdered sugar, chai spice mix and mix until soft peaks form.
Add mascarpone cheese and mix until you have a firm but smooth and creamy mixture. Don't over mix because that can make the mixture grainy. Keep aside.
Assemble. Dip each cake rusk (one at a time) in a large bowl of masala chai tea. Arrange it in your serving dish (Dimensions:...... ) side by side. Try not to leave any space between each cookie.
Pour about ¼ cup of the masala chai tea on top of the rusks.
Use a rubber spatula to spread half the mascarpone filling evenly on top of the chai dipped cookies.
Arrange a second layer of cake rusks on top of the mascarpone filling by dipping each one in chai tea.
Pour another ¼ cup of the masala chai tea on top of the rusks.
Use a spatula to spread the remaining mascarpone filling evenly and smoothly on top of these chai dipped cookies.
Sprinkle chopped pistachios only on the outer edges of the cake.
Cover and chill in fridge overnight or for at least 6 hours.
Cut slices and enjoy.