I’ve had the same thing happen. I used to finish on my stove as well. Untill my wife kicked me out.
If the syrup is really cold and thick as it heats up the steam dosnt bubble through the syrup so it builds up and sometimes comes out as a Big Bang. A little stir every now and then untill it rolls boil solves this problem.
Nitre causes the same thing to happen as well.
Bringing syrup inside and letting it get to room temp before heating up helps too.
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