Hot water or hot milk is used to dissolve the cocoa powder, the solute, in hot chocolate.
Dark, semisweet, or bittersweet chocolate can be grated or broken into small pieces and mixed with milk and sugar to make hot chocolate. Typically, the term "cocoa" refers to a beverage made with heated milk or water, cocoa powder, and sugar-sweetened to taste.
Find real chocolate-based hot chocolate instead of the powdered variety. A prolonged absence will cause it to cool down too much. There is always the choice to stir. Leave 1/4 of the hot chocolate in the cup rather than finishing it off to avoid "gunk"
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