Ganache is the basic preparation for truffles. It is also used for glazing cakes (like the Boston Cream Pie) and frosting cakes and cupcakes. It is the perfect filling for chocolate tarts or crepes.
Chocolate
You can use squares of baking chocolate or good quality chocolate bars. Beware: chocolates with a very high cocoa content (85% or more ) contain too much cocoa butter and could break the ganache.
Corn syrup
Corn syrup helps to retain moisture and prevent the ganache from drying at the surface.