Canning method
Remove blossom petals and wash the crabapples, leaving the stems attached. Puncture each apple’s skin four times with an ice pick or toothpick.
Combine the vinegar, water and sugar and bring to a boil. Tie the cloves, cinnamon and fresh ginger in a spice bag or cheesecloth and add it to the syrup.
Using a blancher basket or sieve, immerse one-third of the apples at a time in the boiling vinegar-syrup solution for 2 minutes.
Place the cooked apples and spice bag in a clean 1- or 2-gallon crock and add the hot syrup. Cover and let stand overnight.
The next day, remove the spice bag. Drain the syrup into a large saucepan and reheat it to boiling.
Fill clean pint jars with the apples and hot syrup, leaving 1/2-inch headspace. Apply the lids.
Process pint jars in a boiling-water canner for 20 minutes at 0–1,000 feet, 25 minutes at 1,001–3,000 feet, 30 minutes at 3,001–6,000 feet, or 35 minutes above 6,000 feet.