Why do you have to boil homemade Kahlua so long?!

Question: Why do you have to boil homemade Kahlua so long!?
I just finnished making my first batch of homemade Kahlua, and my recipe said to boil the coffee,sugar and water and let it simmer for 2 hours!. It got syrupy, but them at the end the recipe said to add more water!.

Why do you have to boil it down, then add more water!? I was just wondering if it would work the same to boil it about 30 minutes to dissolve the sugar!?

I just boil mine long enough to dissolve the sugar and turn clear!. Then I add the instant coffee and stir to dissolve!. After it cools, I add the vodka!. The only reason I can think of for boiling the goo into a syrup would be to add body, something you can do with corn syrup or glycerine!.Www@FoodAQ@Com

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