Hot pepper relish can be canned in a boiling-water bath when the batch follows a tested acidified recipe. Peppers are low-acid on their own. Vinegar at 5% acidity, used in the right amount, brings the mixture into a range that water-bath processing can preserve.
The recipe most extension services use was developed at the University of Georgia and published by the National Center for Home Food Preservation. It makes about 6 pints, uses 10 cups of ground peppers plus onion, and processes for 10 minutes at elevations of 1,000 feet or less.
What usually goes wrong is not the water bath. It is changing the vinegar, adding extra vegetables, skipping altitude adjustments, or treating an untested “family recipe” as if it were lab-checked. Heat level is the one place the official recipe gives you real room to customize.
Why Relish Needs Acid and a Tested Recipe
Clostridium botulinum spores can survive boiling-water temperatures. They do not grow in food that stays at pH 4.6 or lower. Fresh peppers typically sit above that line, so a jar of chopped peppers in water is not a water-bath product. A relish becomes a pickle only when enough 5% vinegar is built into a formula that has already been measured and processed as written.
That is why “add vinegar to taste” is not a canning instruction. Taste can go in the refrigerator version. Shelf-stable jars need the vinegar volume the recipe already tested.
Sugar and salt in this formula mainly affect flavor, texture, and how the relish holds together after cooking. They are not a substitute for vinegar. Do not replace the vinegar with lemon juice, wine, or homemade vinegar of unknown strength.
The Tested Hot Pepper Relish Formula
This is the NCHFP / University of Georgia hot pepper relish. Yield is about 6 pint jars or 12 half-pint jars.
Ingredients
- 5 cups ground green or red bell peppers (about 7 to 8 peppers, or 3 to 4 pounds before grinding), including juice
- 5 cups ground jalapeño peppers (about 3 to 4 pounds before grinding), including juice and seeds
- 1½ cups ground onion (about 3 medium yellow onions), including juice
- 2½ cups distilled white vinegar or cider vinegar, labeled 5% acidity
- 2 cups sugar
- 4 teaspoons pickling or canning salt
- 4 teaspoons mustard seed
Wear gloves. Do not touch your face while cutting or grinding hot peppers. Wash hands with soap and water before you handle anything else.
What you can change
The official note on this recipe is unusually clear: you may change the mix of sweet and hot peppers, and you may use a different hot variety, as long as the total measured ground pepper stays at 10 cups and every other ingredient stays the same.
That means you can:
- Use all jalapeños and fewer bells for a hotter jar
- Use mostly bells and a smaller share of jalapeños for a milder jar
- Swap jalapeños for serranos, Fresnos, or even habaneros by measured ground volume, not by “a few extra peppers”
Habaneros and Scotch bonnets will make a much hotter relish at the same cup measure. Start conservative if you have not used that pepper in a cooked relish before.
You may also leave some or most of the jalapeño seeds out if you want less heat. The recipe developers ground jalapeños with seeds. Removing seeds is a heat adjustment, not a volume change, as long as you still measure 5 cups of ground hot peppers (or whatever split you chose within the 10-cup cap).
What you should not change for canned jars
Leave these alone if the jars will sit on a pantry shelf:
- Vinegar amount or acidity (must be 5%)
- Total ground peppers (no more than 10 cups)
- Onion amount
- Adding low-acid extras: extra onion, garlic by the handful, carrots, extra tomatoes, or fruit
- Oil, butter, or bacon fat
- Flour, cornstarch, or untested thickeners
- Quart jars (this recipe is written for pints and half-pints)
- Homemade vinegar or vinegar that does not say 5% on the label
If you want garlic, extra vegetables, or a looser family formula, make a small pot and refrigerate it. Do not water-bath an untested mix.
Halving or doubling the whole recipe in proportion is generally treated as acceptable for this style of tested pickle, because the ratios stay the same. Do not “scale” by adding more peppers to the same vinegar.
Equipment and Setup
You need a boiling-water canner or a steam canner used according to current steam-canner guidance for acid foods, pint or half-pint jars, new lids, rings, a jar lifter, a funnel, a bubble tool or chopstick, and a large stainless-steel or enameled pot. Aluminum can react with the vinegar.
Keep jars hot until they are filled. Wash them, then hold them in hot water or in a low oven. Prepare lids the way the manufacturer says; many modern lids do not need boiling.
A food processor works if you pulse to a coarse grind and stop before the peppers turn to puree. The recipe was developed with a coarse grinder blade. A paste packs differently and can look dull after processing. Measure the ground vegetables with their juice. Draining them first changes the formula.
Check the vinegar bottle. “Cider vinegar” is fine only when the label reads 5% acidity. Some craft vinegars are weaker.
Step-by-Step Canning Method
- Fill the canner so water will cover filled jars by at least 1 inch. Start heating it while you cook the relish.
- Wash the bells; remove stems and seeds. Slice the stem end from the jalapeños and grind them with seeds unless you are reducing heat. Peel and wash the onions. Cut everything into large chunks, then grind coarse, separately so you can measure each portion.
- Measure 5 cups ground bells with juice, 5 cups ground hot peppers with juice, and 1½ cups ground onion with juice (or your chosen sweet-to-hot split that still totals 10 cups of pepper).
- Combine peppers, onion, vinegar, sugar, salt, and mustard seed in a large pot. Bring to a boil over high heat. Drop to a low boil and cook 30 minutes, stirring often so the sugar does not scorch.
- Ladle the hot relish into hot jars. Leave ½-inch headspace. Slide a bubble tool around the inside of the jar and add more relish if the level drops.
- Wipe rims with a clean, damp paper towel. Apply lids and rings fingertip-tight. Do not crank the rings down.
- Load the jars into the canner. Water must cover the lids by at least 1 inch. Return to a full rolling boil, then start the timer.
Processing time
| Jar size | 0–1,000 ft | 1,001–6,000 ft | Above 6,000 ft |
|---|---|---|---|
| Pints or half-pints, hot pack | 10 minutes | 15 minutes | 20 minutes |
These times are for this relish in a boiling-water canner.
When the time is up, turn off the heat, remove the canner lid, and let the jars stand in the water for 5 minutes. Lift them out. Cool upright, undisturbed, for 12 to 24 hours. Do not retighten the rings.
Check seals. The lid should not flex in the center. Remove rings, wash the jars, label them, and store in a cool, dark, dry place. Refrigerate any jar that did not seal and use it first. Leftover relish that never went into a jar also belongs in the refrigerator.
Heat, Texture, and Flavor Decisions
A 50/50 bell-to-jalapeño grind is already a fairly hot condiment. It works in beans, greens, cream cheese, hot dogs, nachos, and as a sharp side for grilled meat.
If the batch tastes harsh right off the stove, wait. Vinegar and mustard seed settle after a few weeks in the jar. Opening a jar the same day you process it is a poor test of the finished flavor.
White vinegar keeps the color brighter. Cider vinegar adds a rounder, slightly fruity edge and can darken the relish a little. Both are allowed at 5%.
Mustard seed is the only spice in the tested formula. Adding a pinch of dry spice such as celery seed is a smaller risk than adding extra vegetables, but it is still an untested change. If you want a different spice profile, keep the vinegar, salt, sugar, and vegetable measures intact and treat extra spice as a small experiment you are willing to refrigerate if you are unsure.
Do not cook the pot far past 30 minutes to “thicken it more.” Vinegar evaporates as the mixture boils. A long, hard boil can leave you with a less acidic product than the process time assumes. Stir, keep it at a low boil, and stop at the stated time.
Common Problems and How to Avoid Them
The relish looks brown or dull. Overcooking, reactive cookware, or cider vinegar can all darken peppers. Use stainless steel or enamel and stick to the 30-minute boil.
Liquid does not cover the solids. Headspace was too large, or bubbles were left in the jar. Next time, pack hot, debubble, and keep ½ inch of space. A little siphoning after processing is common; as long as the jar sealed and the food still looks normal, it is a quality issue, not an automatic discard. Refrigerate jars with heavy siphoning if you are unsure.
Rings rusted or lids unsealed in storage. Store jars without the rings. Moisture trapped under a ring invites rust and can hide a failed seal.
The relish is watery. The grind was too fine, or the vegetables were unusually juicy. The recipe counts on that juice. You cannot safely thicken a canned batch with starch. For a tighter texture next time, use a coarser grind rather than draining the measured cups.
Eyes and skin burn after prep. Capsaicin stays on boards and knives. Wash tools in hot soapy water. Milk or oil on skin helps more than water if you missed a glove.
Someone inverted the jars instead of processing them. Inverting is not a substitute for a timed boil. Reprocess within 24 hours with a new lid, or refrigerate.
Refrigerator Relish Versus Canned Relish
Water-bath canning is for pantry storage. If you only need a pint for the next few weeks, skip the canner. Cook the same mixture, cool it, and refrigerate. Use it within a few weeks and keep it cold.
Freezing works for cooked relish in freezer containers with headspace. Texture softens after thawing, which is fine for cooking but less ideal on a cracker.
Do not leave an open jar in the pantry. Once the seal is broken, treat it as a refrigerated condiment and use a clean spoon.
Sealed, properly processed jars are typically used within a year for best quality. Cool, dark storage matters more than an exact calendar date. Discard any jar with a bulging lid, spurting liquid, off odor, mold, or slimy texture. Do not taste a suspect jar.
Frequently Asked Questions
Can I water-bath relish in quart jars? Not with this recipe. Use pints or half-pints.
Can I use apple cider vinegar? Yes, if the bottle is labeled 5% acidity. Do not use homemade vinegar.
Can I cut the sugar? Sugar is part of the tested formula. Cutting it changes flavor and body more than it changes the vinegar math, but the safest canned product is the one made as written. For a less sweet condiment, make a small refrigerated batch and adjust there.
Can I add oil for a “pepper oil relish”? No. Oil in a water-bath jar is a safety problem. Keep oil out of the canned product and add it when you serve.
Do I have to peel the peppers? No. Wash them well. Remove stems. Remove seeds from bells. Jalapeño seeds stay in unless you want less heat.
Is a pressure canner better? You do not need one for this acidified relish. Pressure canning is the method for plain peppers without a tested pickle brine. Mixing the two methods is unnecessary here.
My elevation is 4,500 feet. What time do I use? 15 minutes for pints or half-pints. Use 20 minutes above 6,000 feet.
Can I grind different colored bells together? Yes. Green, red, or mixed bells all count toward the 5 cups of sweet pepper (or toward your 10-cup pepper total if you change the split).
Hot pepper relish is a good canning project because the work is mostly grinding and stirring, and the official formula already tells you where you can play with heat. Keep the vinegar, the 10-cup pepper cap, the ½-inch headspace, and the altitude time. That is the difference between a jar you can put on a shelf and a pot that belongs in the fridge.