To reheat chilled hot chocolate: Working in a medium saucepan over low heat, warm the chocolate, stirring gently, just until the first bubble pops on the surface. Pull the pan from the heat, whip the chocolate for 1 minute with a hand-held blender (or in a traditional blender), and serve immediately.
To make cold hot chocolate: Chill the hot chocolate until it is very cold, then stir in 3/4 cup (200 grams) cold milk. Whip the cold chocolate for 1 minute with a hand-held blender (or in a traditional blender). Serve the cold hot chocolate over an ice cube or two.
Keeping: Once blended, the hot chocolate can be cooled and refrigerated in a tightly sealed jar for 2 days; reheat gently, or serve as cold hot chocolate.
Cold hot chocolate makes a fabulous ice cream float. Greenspan whips the cold chocolate to froth, pours it into a tall glass — beer glasses are great for this — and adds ice cream. While the traditional go-with-chocolate flavors, like vanilla, coffee, vanilla-fudge, and chocolate in all its renditions, are always good, her favorite floatable flavor is Ben & Jerry’s Cherry Garcia. serves 4