In another bowl or a jar, combine the cucumbers and the cilantro.
Pour the vinegar mixture over the cucumbers and toss to coat them.
Let the cucumbers sit at room temperature for about 30 minutes, tossing every few minutes to coat them with the brine, then transfer them to a glass jar and move them to the refrigerator.
Once in the fridge, I like to invert the jar a few times to make sure the seasoning distributes evenly.
Let the pickles sit in the fridge for at least an hour before enjoying them, but they will be even better if you let them sit overnight.
Notes
After you eat all the pickles, you can reuse the brine. I like to bring it to a boil for the second use and pour it over more cucumbers or thinly sliced carrots!
Storage
Korean pickled cucumbers are not shelf-stable, so they need to be stored in the fridge. They should last at least a week, but we usually eat them within two days. (Discard the pickles if the liquid gets cloudy or smells funny.)
What to Serve with Korean Pickles
I like to make a rice bowl and combine the cucumber pickles with bulgogi, rice, and Yum Yum sauce. You can also just snack on them!*Soft stems refer to the thinner stems near the leaves - I chop the bunch in the middle like cutting the top off of broccoli, then use that part. Save the bottom for making pho broth!