01 - Combine mashed ube, granulated sugar, coconut milk, ube extract, and salt in a saucepan. Cook over medium heat, stirring constantly, until the mixture becomes smooth and slightly thickened, about 5 minutes. Remove from heat and cool to room temperature.
02 - Blend shelled pistachios, whole milk, heavy cream, honey or sugar, vanilla extract, and salt until smooth. Pour the mixture into a saucepan and gently heat over medium-low, stirring often for 5 minutes. Do not allow to boil. Remove from heat and cool.
03 - Pour the cooled ube mixture evenly into popsicle molds, filling halfway. Freeze for 1 hour until partially set.
04 - Once the ube layer is set, pour the pistachio mixture over each mold, filling to the top. Insert sticks and freeze for at least 5 hours, or until completely solid.
05 - Remove bars from molds. Optionally, drizzle with sweetened condensed milk and sprinkle chopped pistachios before serving.