Wash and slice peppers into ¼ inch thick rings. Discard seeds if desired.
Fill mason jar with pepper rings.
Add dill, celery flakes, peppercorns, and garlic cloves to the jar.
In a sauce pan combine, water, vinegar, Kosher salt and sugar.
Bring to a boil, stirring occasionally to make sure the sugar and salt are completely dissolved.
Pour liquid into the mason jar, making sure the contents are completely submerged in the liquid.
Screw on a lid and the shake jar to combine all the ingredients.
Allow mixture to come to room temperature on the counter.
Once contents have come to room temperature, place the jar in the fridge.
Peppers are ready to eat after marinating for 24-48 hours.
Peppers will keep in the refrigerator for up to a month.