Cut the cauliflower into small florets. Thinly slice the carrots and celery stalks. Dice the bell peppers. Peel the pearl onions and finely chop 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, honey, mustard seeds, black peppercorns, and bay leaves. 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 stand for at least 10 minutes to allow the vegetables to soften slightly.
Drain the vegetables, then mix them with the olives and pearl onions. Transfer the mixture to sterilized jars.
Pour the extra virgin olive oil over the vegetables, making sure 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 further if you let it stand for a few days. It will keep in the refrigerator for 2-3 weeks.
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