Prepare the vegetables: Thinly slice the cabbage, jalapenos, carrot, and red onion. Place all the vegetables into a large mixing bowl.
Make the pickling brine:In a saucepan, combine the apple cider vinegar, water, sugar, salt, peppercorns, mustard seeds (if using), and smashed garlic clove. Bring the mixture to a boil, stirring until the sugar and salt dissolve.
Pickle the vegetables: Pour the hot brine over the sliced vegetables in the mixing bowl. Toss everything together to ensure the vegetables are fully coated with the brine.
Pack into jars:Transfer the vegetables and brine into clean mason jars, pressing down to submerge the vegetables. Let them cool to room temperature, then seal the jars tightly.
Pickling time: Refrigerate for at least 2 hours to let the flavors develop. For a more intense flavor, let the cabbage pickle overnight.
Serve: Once pickled, the cabbage can be enjoyed straight from the jar. Garnish with fresh cilantro before serving if desired.
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Notes
Customize the heat: Adjust the number of jalapenos to your spice preference. Removing the seeds will reduce the heat.
Make it sweeter: Add more sugar if you prefer a sweeter pickling brine.
Crunch factor: For extra-crunchy cabbage, don’t pour the hot brine directly over the vegetables. Let the brine cool first.