01 - In a saucepan, combine mashed ube, granulated sugar, coconut milk, ube extract, and a pinch of salt. Cook over medium heat, stirring constantly, until the mixture is smooth and slightly thickened, about 5 minutes. Remove from heat and allow to cool to room temperature.
02 - In a blender, blend unsalted pistachios, whole milk, heavy cream, honey or sugar, vanilla extract, and salt until smooth. Pour into a saucepan and heat gently over medium-low, stirring often, for 5 minutes without boiling. Remove from heat and let cool.
03 - Pour cooled ube mixture evenly into ice cream bar molds, filling halfway. Freeze for 1 hour, or until set. Add the pistachio mixture to molds, filling to the top. Insert sticks and freeze for at least 5 hours, until fully solid.
04 - Remove bars from molds. Optionally, drizzle with sweetened condensed milk and sprinkle with chopped pistachios before serving.