12 ounces semisweet chocolate, coarsely chopped
4 ounces bittersweet chocolate, coarsely chopped
1 cup heavy cream
1/2 cup milk
1 teaspoon vanilla extract
Pinch kosher salt
2 tablespoons bourbon or orange, coffee or hazelnut liqueur, optional
While keeping the fondue warm, water will collect on the inside of the lid of the slow cooker; when you remove the lid to stir the fondue, wipe the excess water off as too much water dripping into the chocolate will eventually cause it to seize or separate.