• Begin by placing a 9x5-inch loaf pan in the freezer to chill while you prepare the components.

Make the ube ganache:

• Roughly chop the white chocolate and place it in a medium heatproof bowl, or simply use white chocolate chips. Add the ube extract and a small pinch of kosher salt. In a small saucepan, warm the heavy cream over medium-high heat until it just begins to bubble around the edges — about 2 minutes. Pour the hot cream immediately over the chocolate mixture and let it sit undisturbed for 1 minute. Stir gently until the chocolate melts completely and the ganache turns smooth and glossy. Allow it to cool for about 15 minutes to thicken slightly before using.

Make the ice cream base:

• In a large mixing bowl, whisk together the sweetened condensed milk, vanilla extract, and kosher salt until well blended. Set aside.
• In the bowl of a stand mixer fitted with the whisk attachment — or using a hand mixer — beat the cold heavy cream on medium-high speed until stiff peaks form, about 2 to 3 minutes. Scoop about 1 cup of the whipped cream into the condensed milk mixture and stir gently to combine; this step lightens the base and ensures a smoother texture. Carefully fold in the remaining whipped cream using a spatula, turning the bowl as you go. Continue folding until the mixture becomes silky and cohesive, leaving only a few small lumps — avoid overmixing to keep it airy.

Assemble the ice cream:

• Spread one-third of the ice cream base evenly into the chilled loaf pan. Drizzle a third of the ube ganache over it. Repeat this process with the next two layers, alternating between the ice cream base and ganache. Once all layers are added, run a knife through the mixture in a gentle swirling motion to create a marbled effect.
• Cover the loaf pan tightly with plastic wrap and freeze for at least 6 hours, or until completely firm. For the best texture and flavor, let it freeze overnight. The ice cream can be stored in the freezer for up to one week — perfect for a creamy, vibrant dessert anytime you crave something sweet and tropical.