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1. Heat the heavy cream in saucepan until the edges show signs of boiling.
2. Reduce heat to low.
3. Stir in granulated sugar and light brown sugar, cocoa powder, unsalted butter, bittersweet chocolate, espresso powder and salt.
4. Cook until mixture is smooth and sugar and chocolate has melted.
5. Remove saucepan from heat.
6. Stir in coffee liqueur and vanilla extract. Cool.
7. Transfer to airtight jars. Keep sauce refrigerated up to 2 weeks.
8. Reheat gently to use.
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