Peel, core and roughly dice the apples - smaller means less cook time needed.
Add all ingredients to a saucepan and bring to the boil, then reduce the heat and let simmer for 20 minutes, stirring occasionally.
Pour the contents of the pan through a fine mesh sieve/strainer/cheese cloth over a bowl to remove the pieces of apple, leaving you with a smooth syrup.
Once cool, pour the syrup into a jar/container and store in the refrigerator for 1-2 weeks.