2/3 cup heavy cream = 155 grams 1/2 cup light corn syrup = 155 grams 1/3 cup dark brown sugar = 67 grams 1/4 cup cocoa powder = 25 grams 6 oz. (browneyedbaker.com)
If you don't want to buy it, you can use 2 tablespoons of light corn syrup in place of the glucose called for. (bakeyourday.net)
To make caramel, combine 1/4 cup sugar, 1 1/2 teaspoons light corn syrup, and 1 tablespoon water in a heavy saucepan over medium - high heat. (health.com)