This article provides tips and substitutions for replacing unsweetened chocolate in baking. It explains that unsweetened chocolate is made from ground cacao beans with cocoa butter, while cocoa powder is the dried, defatted cocoa mass. Bittersweet chocolate is essentially unsweetened chocolate with a small amount of sugar. To substitute unsweetened chocolate, you can use bittersweet chocolate and reduce the sugar in the recipe.

Alternatively, you can use cocoa powder with added fat, such as vegetable oil or butter. This substitution works best for baked goods, not uncooked puddings or frostings.