Instructions: Combine powdered sugar and almond flour and sift them. Put aside. Beat the 55g of egg whites until frothy in a mixing bowl. After adding the cream of tartar, beat the mixture until soft peaks form. Put aside. Add water and granulated sugar to a saucepan. Using a candy thermometer, heat over medium-high heat until it reaches 118C 244F. In a separate bowl, beat the remaining 55g egg whites until soft peaks form while the syrup heats. Pour the sugar syrup into the whipped egg whites gradually while beating at a low speed, once it reaches 118C 244F. Raise the speed to medium-high and continue beating until stiff peaks form and the meringue becomes glossy. Beat in the vanilla extract and green food coloring, if using, until well combined with the meringue. Three additions of the almond flour and powdered sugar mixture should be folded into the meringue until the batter is smooth and has the consistency of ribbon when it slides off the spatula. Spoon the batter into a piping bag that has a round tip attached. Pipe tiny rounds onto a parchment paper-lined baking sheet. After removing any air bubbles by tapping the baking sheet against the counter, allow the macarons to rest for 20 to 30 minutes, or until a skin forms on top. Set the oven temperature to 300F 150C. Bake for 15 to 18 minutes, or until the macarons come off the parchment paper easily. After baking, leave the macarons on the baking sheet to cool fully. Sort the macaron shells into pairs based on size, then top one of the shells in each pair with a dab of pomegranate jam. Place them in a sandwich. To decorate, roll the macaron edges in crushed pistachios. Savor your homemade macarons with pistachio and pomegranate cake!