Peel the carrots and slice them into thin rounds or diagonal pieces that are easy to eat while maintaining their crunch.
Heat a small amount of water in a saucepan and lightly simmer the carrots for 2–3 minutes to soften them slightly without making them mushy.
Add sliced jalapeños, onions, garlic, oregano, and bay leaves into clean glass jars.
Arrange the carrots inside the jars, mixing them with the jalapeños and onions so the flavors distribute evenly.
Combine vinegar, water, salt, and sugar in a saucepan and heat until the seasoning dissolves into a clear brine.
Pour the warm liquid over the vegetables until everything is covered, then let the jars cool before sealing.
Refrigerate for at least one day before serving, allowing the carrots to absorb the spicy, tangy Mexican-inspired flavors.