Why pickles, not canned vegetables
These four vegetables are low-acid. There is no recommended boiling-water canning method for unpickled vegetables; boiling water does not exceed 100°C / 212°F and cannot destroy botulinum spores. Acidifying vegetables with vinegar prevents the spores from growing and makes pickles safe. That is why this recipe makes pickles; the jars are not boiled to “sterilize” them.