Taken from the fantastic Mission Chinese cookbook, where he unexpectedly has some banger BBQ recipes. These are intended as a compliment to some Sous Vide BBQ Brisket., but are also just a delicious snack.
Mix up the cucumber and sliced onion in a bowl and salt them until they reach the level of salt you'd like to taste in the final pickle
Add the minced garlic, chopped dill, peppercorns, fennel seeds, and red pepper flakes and mix them all together
Cover the bowl with plastic wrap and leave in the fridge overnight
The next day, drain away all the liquid that has accumulated in the bowl and cover the vegetables in white vinegar
Leave everything to soak in the vinegar for 3-4 hours in the fridge
Drain off the vinegar and store in an airtight container for up to a week