Prepare your jars by scalding with boiling water, or running through a hot dishwasher cycle, then standing in an oven, preheated to 150C for 10 minutes.
Wash cucumbers, top and tail them, slice into sticks.
Place garlic, fennel, and spices into bottom of sterilised jars.
Pack cucumber sticks in jar, upright, with cinnamon nestled in the middle.
Bring water, cider vinegar and salt to boil, then pour over cucumber, ensuring it is covered.
Seal jars, allow to cool, then refrigerate.