01 - Combine mashed ube, granulated sugar, coconut milk, ube extract, and a pinch of salt in a medium saucepan. Stir constantly over medium heat until the mixture is smooth and slightly thickened, approximately 5 minutes. Remove from heat and allow to cool to room temperature.
02 - Blend shelled pistachios, whole milk, heavy cream, honey or sugar, vanilla extract, and a pinch of salt until thoroughly smooth. Transfer to a saucepan and heat gently over medium-low, stirring often, for 5 minutes without boiling. Remove from heat and let cool.
03 - Pour the cooled ube mixture evenly into ice cream bar molds, filling each mold halfway. Place molds in the freezer for 1 hour until the layer is set.
04 - Pour pistachio mixture over the set ube layer, filling molds to the top. Insert popsicle sticks and freeze molds for a minimum of 5 hours or until fully solidified.
05 - Remove ice cream bars from molds. Optionally, drizzle each bar with sweetened condensed milk and sprinkle with chopped pistachios before serving.