Cut the cauliflower into small florets. Thinly slice the carrots and celery stalks. Dice the red bell pepper and finely mince the garlic.
In a large pot, bring 500 ml of water and 500 ml of white wine vinegar to a boil. Add the salt, sugar, dried oregano, and red pepper flakes. Stir until the salt and sugar are completely dissolved.
Place the vegetables in a large bowl, then pour the hot vinegar mixture over them. Let it sit for at least 10 minutes to allow the vegetables to soften slightly.
Drain the vegetables, then mix them with the green olives and the finely chopped jalapeño peppers. Transfer everything to sterilized jars.
Pour the extra virgin olive oil over the vegetables, ensuring they are completely submerged. Seal the jars and refrigerate for at least 24 hours to allow the flavors to meld.
The giardiniera is ready to eat after 1 day, but the flavors will deepen if you let it sit for a few days. It will keep in the refrigerator for 2-3 weeks.
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