01 -
Refrigerate the bowl after covering it for an hour. This helps the flavors blend and lets the cucumbers start soaking up the pickling liquid.
02 -
Get a ladle and canning funnel ready. Spoon the cold mixture into two clean 1-litre jars, packing the veggies lightly.
03 -
In a big mixing bowl, throw in the sliced cucumbers and onions, along with the sugar, vinegar, salt, celery seed, and mustard seed. Mix it all together until everything is well combined and the sugar and salt have dissolved.
04 -
Use a sharp knife or mandoline to slice the cucumbers and onion into thin, even pieces.
05 -
Seal the jars and pop them in the fridge. They'll be ready to eat after chilling, and they'll stay fresh for several weeks if kept cold.