You said sanitize the bag - is this commercial dark candi syrup? When I made my own, the process was bringing sugar / corn syrup to a simmer, so boiling was part of the creation anyway. I would bring the syrup to a simmer to sanitize even if it's commercial, it won't harm the syrup and it buys peace of mind.
However, I would say much higher than 1.080 OG is getting too high for the "style" of Belgian dubbel, you're entering Belgian dark strong ale territory.
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