The Best Way To Thicken BBQ Sauce For A Glaze - Tasting Table
Briefly

Adding sugar and letting it reduce slowly is the best way to thicken it when being used as a glaze. The sweet addition is the biggest differentiator between glaze and standard sauces.
Reducing BBQ sauce into a tasty, thicker glaze takes as little as 15 minutes over medium heat. The very sugar that sets a glaze aside from sauce makes it equally vulnerable to burning.
Read at Tasting Table
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