3 ounces = 90 grams
Substitution for 1 ounce (30 grams) unsweetened chocolate: 3 tablespoons (18 grams) unsweetened natural cocoa powder plus 1 tablespoon (17 grams) unsalted butter or shortening
Unsweetened chocolate is also called baking, plain or bitter chocolate.
This is chocolate in its rawest form. Chocolate liquor that has been refined and contains 50-55% cocoa butter. The quality of the chocolate is determined by the type of cocoa beans used and how they have been processed. Since no sugar has been added to the chocolate it has a strong, bitter taste that is used in cooking and baking but is never eaten out of hand.
Unsweetened chocolate, if well wrapped and stored in a cool dry place with good air circulation, will keep several years.