Add the cranberries, sugar, and water to a saucepan over medium heat. Allow them to cook for about 5-10 minutes until juices release. Use the back of a spoon or spatula to break up the cranberries.
2 cups cranberries, ⅓ cup granulated sugar, ½ cup water
Puree the cranberries completely, then pass the puree through a fine mesh sieve into a bowl. Allow it to cool to room temperature.
Preheat the oven to 350℉/180℃.
Use a food processor to grind up the Biscoff cookies into a fine crumb.
2 cups ground biscoff cookies
Add the melted butter and salt and use a fork to combine until the crumbs are fully moistened.
6 tablespoon unsalted butter, ¼ teaspoon kosher salt
Press the crumbs tightly into a tart pan, then bake for 10 minutes. Remove to a wire rack to cool completely.
Add the heavy whipping cream to a saucepan over medium heat and bring to a simmer, stirring occassionally.
1¼ cups heavy whipping cream
Add the white chocolate to a large bowl, then pour the heavy cream over top. Allow it to stand for 1 minute.
600 g white chocolate
Use a rubber spatula to stir the mixture together, starting from the center and working your way outwards, repeating the process until completely smooth.
Add one tablespoon of butter and mix until melted, then add the next piece and stir until smooth. If using, add a few drops of white food coloring to brighten the mixture.
2 tablespoons unsalted butter, white food coloring
Allow the ganache to cool for about 10 minutes and thicken slightly. Pour the ganache into the cooled crust.
Transfer the cranberry puree to a piping bag or zip top bag and snip off a small corner. Drizzle the puree onto the white chocolate ganache in random squiggles, leaving open spaces of white chocolate showing.
Use a butter knife to swirl the cranberry and white chocolate together into a decorative pattern, then transfer the tart (uncovered) to the fridge to set.
If desired, make sugared cranberries, then decorate the top of the pie before slicing and serving. sugared cranberries