Makes 1 pint
1 ¼ cups (300 milliliters) heavy or double cream, well-chilled
2/3 cup (175 grams) sweetened condensed milk
2 tablespoons instant espresso powder
2 tablespoons espresso liqueur
Whisk all the ingredients together just until the whisk leaves trails of soft peaks in the bowl, and you have a gorgeous, caffe-latte-colored airy mixture.
Fill two 500-milliliter or two 1-pint airtight containers, and freeze for 6 hours or overnight. Serve straight from the freezer.