Remove the stalks and pips from the cherries and set aside
Measure the orange juice in a jug and top it up with water to reach 1 cup (250ml). Add this to a medium-sized pot along with the sugar, port, star anise, orange zest, cinnamon, and vanilla pod.
Bring this to a boil stirring to dissolve the sugar and then add the cherries. Cook for 3.5 minutes then remove with a slotted spoon and place them in the sterilized jar.
Cook the port syrup for 10 minutes over low heat allowing it to thicken. Once cooked add the vanilla extract if you did not use a vanilla pod.
Remove the aromatics from the liquid and pour this into the jars with the cherries. Seal the lid and turn them upside down for a few minutes until cool.
Store them in the fridge until you use them.
*If you want to preserve these cherries for longer, follow the process to properly seal and boil the jars.