Canning method
Preheat the canner water to 180°F for hot-packed jars. Wash and rinse the jars, then keep them hot. Prepare lids and bands as their manufacturer directs. Wear gloves when handling hot peppers; keep your hands away from your eyes and face.
Wash, peel and trim the jicama, then dice it. Prepare the remaining vegetables to the sizes specified in the ingredient list.
Tie the mixed pickling spice and cinnamon in a double layer of 100% cotton cheesecloth about 6 inches square, or use a muslin spice bag.
In a roomy saucepot, bring the spice bag, vinegar, sugar and crushed red pepper to a boil, dissolving the sugar.
Add the jicama, bell peppers, onion and fingerhot peppers. Return to a boil, then cover and simmer over medium-low heat for about 25 minutes. Remove and discard the spice bag.
Fill hot pint jars with the hot relish and its pickling liquid, leaving 1/2 inch headspace. Release air bubbles, restore headspace, clean the rims and fit lids.
Use a rack and keep jars upright. Water must cover the lids by at least 1 inch, or 2 inches when processing longer than 30 minutes. Cover the canner; begin timing at a full boil and keep it boiling throughout. If boiling stops, bring it back to a boil and restart the full processing time.
Process in boiling water: 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. Follow the canner directions above.
After processing, turn off the heat, remove the canner lid and wait 5 minutes. Lift jars out upright onto a towel or cooling rack. Leave undisturbed for 12–24 hours, then check seals. Refrigerate unsealed jars and use them first. Remove bands from sealed jars, clean and label them, and store in a cool, dry place away from sunlight.