Thandai Tres Leches Cake

Name: Thandai Tres Leches Cake
Ingredients: 4 cups whole milk; 1 cup blanched almonds; 1 cup unsalted cashews; 1/2 cup granulated sugar; 10 green cardamom pods; 1 teaspoon fennel seeds; 1 teaspoon melon seeds, optional; 1 teaspoon white poppy seeds, optional; 1/2 teaspoon peppercorns; Pinch saffron; One 14-ounce can condensed milk; 1 tablespoon rose water; 3 2/3 cups all-purpose flour; 2 1/4 cups granulated sugar; 2 teaspoons baking powder; 1 teaspoon baking soda; 2 teaspoons kosher salt; 8 large egg whites; 1/3 cup (80 milliliters) sour cream; 1 tablespoon green cardamom powder; 2 sticks (1 cup) unsalted butter, at room temperature; 3 cups heavy cream; 1 cup confectioners' sugar; 1 teaspoon green cardamom powder; 8 ounces cream cheese, at room temperature; Dried rose petals, for garnish; Chopped pistachios, for garnish; Saffron threads, for garnish; Gold leaf, for garnish