Remove the stems and slice jalapeño into round ½" slices.
To make the jalapenos less spicy, remove some of the seeds. Set the pepper slices aside.
In a large pot, add the cider vinegar, white sugar, garlic, turmeric (if using), pepper corns and bring to a boil.
Reduce the heat to medium and simmer for 5 minutes, stirring occasionally.
Raise the heat, add the pepper slices, return to medium heat and simmer for 5 minutes.
Ladle the cooked jalapeño slices into the clean glass jar.
Return the syrup to a boil for about 5 minutes.
Now add hot syrup into the jars over the jalapeño rings, leaving ½ inch of head room in the jar.