Excellent video. Thanks for sharing it.
It surprises me on two counts. First of all, that a commercial pipe tobacco blender is sharing his proprietary recipe. Secondly, is the butt-load of stuff cooked into it.
Cooking a sugar solution with acid (tartaric, in this instance; lemon juice or citric acid, when making jelly or jam) converts the sucrose into a much sweeter tasting sugar.
It tastes sweeter for the same weight of sugar, because the disaccharide (the dextrose of table sugar) is cleaved in half, to form fructose and glucose--twice as many molecules, so "twice" the concentration of sweetener by weight.
I was relieved to see that the spices were bagged and steeped in the solution, rather than blenderized and added directly. Unwilling to create such a top dressing myself, I will take a wild guess, and say that it tastes like Christmas candies and cookies.
Unfortunately, he does not show the manner in which the top dressing is applied to the blended tobacco.
Bob