6 tb Butter; unsalted
2/3 c  Sugar
2/3 c  Brown sugar; dark
1 c  Unsweetened cocoa powder
2/3 c  Heavy cream
1/8 ts Salt

Combine all ingredients in a medium saucepan. cook over a medium heat,
stirring constantly, until butter melts. Reduce heat to low. Cook, stirring
constantly until sugar melts and sauce is smooth. Serve warm. Store in a
tightly covered container in the refrigerator for up to 1 month. Reheat
over hot water.