How is apple syrup made?
When I make apple syrup, I use apples (2 cut, peeled, sliced, and cored), sugar (1/2c), and two tablespoons of water.  Combine everything, let the sugar dissolve, and then bring to a boil.  Let it simmer for 10 minutes until the apples have become nice and soft and the syrup thickens.  I usually do it for a bit longer just to be on the safe side.  I have also found that adding a bit of cinnamon gives it just a bit extra!