What is a conserve, and can I add nuts or liqueur?

A conserve is a jam-like preserve made from a mix of fruits, often with citrus, dried fruit such as raisins, and nuts stirred in near the end. You can add nuts or a liqueur, but only in the amounts and at the point a tested conserve recipe gives, because nuts and raisins are low-acid ingredients and alcohol changes the set. Tested conserves exist from the University of Georgia and from Pomona's Pectin, and this page lays them side by side. It also explains why a conserve cannot be sold as "jam," and what its label must say about nuts.

How a conserve differs from jam

The tested recipes show the pattern. A conserve starts with a fruit that sets well, adds citrus peel and pulp for pectin and brightness, adds raisins or other dried fruit for body and sweetness, and finishes with chopped nuts. It is cooked almost to the jellying point, so it is thick and chunky rather than smooth.

Two things set it apart from jam beyond taste:

• It has no federal standard. Penn State Extension's commercial primer notes that conserves, marmalades and spreads have no standards of identity and need no soluble-solids testing [3]. The jam standard (21 CFR 150.160) allows a closed list of optional ingredients: sweeteners, spice, acidifying agents, pectin to make up a shortfall, buffering agents, preservatives and antifoaming agents not derived from animal fat [4]. Nuts and raisins are not on it. A conserve is therefore a different food, sold under its own name.
• It carries low-acid ingredients. Penn State names "conserves containing raisins and nuts" among the products with low-acid ingredients, and advises commercial makers of such products to confirm with a pH meter that the finished pH is well below the 4.6 limit for acidified foods [3]. In a tested recipe the fruit and sugar carry the nuts safely. Adding more nuts, or nuts to a recipe that had none, takes you outside what was tested.

Tested conserves you can follow

The National Center for Home Food Preservation lists six conserves among its jam and jelly recipes: apple, apricot-orange, cranberry, damson plum-orange, grape and plum [2]. Two published versions with full directions show how much variation sits inside "conserve":

Notice that the two recipes put the nuts in at opposite ends of the cook. Each timing is part of that recipe. Do not move the nuts in one recipe to match the other.

Making the plum conserve

1. Sterilize canning jars [1] and prepare two-piece lids.
2. Combine the plums, orange peel, raisins, orange pulp and sugar. Bring slowly to a boil, stirring occasionally until the sugar dissolves [1].
3. Cook rapidly, about 15 to 20 minutes, almost to the jellying point, 8°F above the boiling point of water (220°F at sea level). Stir frequently to prevent sticking [1].
4. Add the nuts during the last 5 minutes of cooking [1].
5. Pour into hot, sterile jars, leaving 1/4 inch headspace. Wipe the rims with a dampened clean paper towel, put on two-piece lids and process in a boiling water canner [1].

Thick conserves scorch easily in the final minutes, which is exactly when the nuts go in. Use a wide, heavy pan and stir along the bottom.

Processing times by elevation

The two recipes come with different charts because they start from different jars. The plum conserve uses sterilized jars, half-pints or pints: 5 minutes up to 1,000 feet, 10 minutes from 1,001 to 6,000 feet and 15 minutes above 6,000 feet [1]. The Pomona's conserve gives 10 minutes up to 1,000 feet, 15 minutes at 1,001 to 3,000, 20 at 3,001 to 6,000, 25 at 6,001 to 8,000 and 30 at 8,001 to 10,000, in a boiling water or atmospheric steam canner [5].

Follow the chart that came with your recipe. If you make the plum conserve but do not sterilize the jars, NCHFP says the jars need a full 10 minute process plus the altitude adjustment [6], which puts you on the longer pattern. The full explanation, including why you never mix one chart's base time with another's altitude steps, is on how long to process jam.

Adding liqueur or spirits

In a conserve, spirits are there for flavor and do nothing to help it keep. They also thin the gel, and a large splash can leave a conserve that never firms up.

The clearest published allowance comes from Pomona's Pectin, whose recipe-building directions let you add 1/4 cup of alcohol per 4 cups of mashed fruit or juice, and reduce the fruit or juice by 1/4 cup to make room for it [7]. That is a rule for recipes made with that pectin. It does not carry over to a regular pectin recipe or a no-pectin conserve like the plum conserve above, whose sources give no alcohol allowance.

Practical points if you add spirits within a recipe's limit:

• Stir the liqueur in at the end of cooking, just before filling, so more of its flavor survives the boil.
• Choose a spirit that matches the fruit (orange liqueur with apricot-orange, brandy with plum, bourbon with apple) and measure it; do not pour by eye.
• If you want more than the recipe allows, add it at the table instead: spoon a little over the conserve when you serve it.

Wine and liqueur jellies are their own product with their own tested recipes; herb, flower and wine jellies covers them.

Changing the nuts and dried fruit safely

Inside a tested conserve you have some room:

• Swapping nuts for nuts. The plum conserve itself says "pecans or other nuts" [1], so walnuts or almonds in the same 2 cup measure stay within the recipe.
• Swapping dried fruit. Replacing raisins with chopped dried cherries or cranberries is a common flavor change, but none of the sources here tested it. A jar made that way is an untested product: keep it in the refrigerator or freezer rather than on the shelf.
• Leaving nuts out. Taking the nuts out removes a low-acid ingredient rather than adding one, so it moves the recipe in the safer direction. The tested sources do not address it directly, and the conserve will be a little looser without them.
• Adding more nuts, seeds or new low-acid items. Do not. Extra nuts, coconut, seeds or chocolate change the acidity and density in ways nobody has tested. Add them when you serve it.

The general rules for what you can and cannot change in any tested recipe, with the reasons, are on what you can change in a tested recipe.

Labeling a conserve with nuts

If you give conserves away, write the nut on the jar tag so nobody with an allergy is caught out. If you sell them, the label has to name it.

Tree nuts and peanuts are among the major food allergens that a label must declare; Utah's cottage food labeling sheet, for example, lists milk, egg, fish, shellfish, tree nuts, wheat, peanuts, soybeans and sesame, and its sample label names the specific nut ("CONTAINS ... WALNUTS") [8]. Federal labeling rules in 21 CFR Part 101 carry the allergen requirements for packaged food [3], and many state cottage food rules add their own allergen or kitchen statements. Name the nut itself (pecans, walnuts) rather than writing "nuts."

The name on the front should be truthful and specific, such as "Plum Conserve with Pecans." It should not say "jam" or "preserves," because a conserve with nuts and raisins falls outside the optional ingredients the jam standard allows [4]. What the rest of the label must carry (net weight, ingredients by weight, name and address) is on what a jam label must say, and what a standardized jam may contain is on what a jam you sell can contain.

Check your state's cottage food list before you sell conserves. Lists that name "jams and jellies" or that tie eligibility to the federal standards may not include a nonstandard product with nuts, and your state agency is the one that decides.

Where to find more tested conserves

Start with the six NCHFP conserves [2], the conserve recipes in So Easy to Preserve, and the recipe leaflet inside a pectin box. Treat a conserve from a blog or an old family card the way you would any untested recipe: refrigerate or freeze it rather than shelving it. How to tell a tested recipe from an untested one is on recipes you can trust.

References

1. WSU Clark County Extension Master Food Preservers, Plum Conserve (adapted from So Easy to Preserve, 6th ed., 2014, University of Georgia Bulletin 989), undated. https://s3.wp.wsu.edu/uploads/sites/2079/2020/07/Plum-Conserve.pdf
2. National Center for Home Food Preservation, Jams and Jellies (recipe index), accessed October 2026. https://nchfp.uga.edu/how/make-jam-jelly
3. Penn State Extension, LaBorde, Food for Profit: Commercial Production of Jams, Jellies and Fruit Butters, updated May 24, 2024. https://extension.psu.edu/food-for-profit-commercial-production-of-jams-jellies-and-fruit-butters
4. Code of Federal Regulations, 21 CFR 150.160, Fruit preserves and jams (Cornell LII), current. https://www.law.cornell.edu/cfr/text/21/150.160
5. UC Master Food Preserver Program, Apple Walnut Raisin Conserve (from Preserving with Pomona's Pectin, 2013), file 1-0024, undated. https://class.ucanr.edu/sites/default/files/2020-09/335096.pdf
6. National Center for Home Food Preservation, Do I need to pre-sterilize my jars before canning?, May 21, 2014. https://nchfp.uga.edu/blog/do-i-need-to-pre-sterilize-my-jars-before-canning
7. Pomona's Universal Pectin, Create Your Own Recipe, modified August 24, 2023. https://pomonapectin.com/?p=21164
8. Utah Department of Agriculture and Food, Basic Labeling Guidelines for the Home Consumption and Homemade Food Act, undated (viewed October 2026). https://ag.utah.gov/wp-content/uploads/Basic-Labeling-Guidelines-for-Home-Consumption-and-Homemade-Foods.pdf