Though it claims to be a product of the city of Liege, it is more broadly a regional product that can be found in the Dutch (Appelstroop) and German (Apfelkraut) speaking parts of the region as well. The version from Liege incorporates pears into the syrup instead of just apple. This recipe differs from the more traditional ones in that we add sugar. This is simply easier, and you could of course, add more fruit until the desired level of sweetness is achieved.