bittersweet chocolate
US /ˈbɪtərˌswit ˈtʃɑklət/
UK /ˈbɪtərˌswit ˈtʃɑklət/

1.
a type of dark chocolate that contains less sugar than semisweet chocolate but more than unsweetened chocolate, offering a balance of bitter and sweet flavors
:
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She used bittersweet chocolate to make rich brownies.
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The recipe calls for 70% cocoa bittersweet chocolate.