Learn how to make jam successfully – with a little help from pectin
I’m feeling tired of winter and dreaming of warmer days full of fresh fruit and jars of jam. To prepare for the upcoming harvest, it’s helpful to understand what turns ripe fruit and sugar into a glossy, set jam. Knowing about pectin and how to work with it will make your jam-making more reliable and enjoyable.
What is Pectin?
Pectin is a type of soluble dietary fiber that occurs naturally in many plants, especially fruits. While insoluble fiber adds bulk and helps digestion, soluble fiber dissolves in water to form a gel. That gelling quality is exactly what allows a pot of fruit and sugar to thicken into jam.
Soluble fiber can also contribute to satiety and help moderate blood cholesterol and blood sugar. In jam-making, pectin’s ability to form a gel is the key factor in getting a firm set.
Which Fruits are Naturally High in Pectin?
All fruits contain some pectin, but levels vary. Fruits that are naturally high in pectin are especially useful for making jellies and jams that set easily:
- Crab apples and other tart apples
- Sour blackberries
- Concord grapes
- Cranberries
- Quince
- Lemons and limes
- Most plums
- Bitter oranges
Which Fruits are Naturally Low in Pectin?
Some fruits have relatively low pectin levels and may need help to set properly in jam recipes:
- Blueberries
- Pears
- Raspberries
- Strawberries
- Sweet cherries
Which Fruits are in Between?
Pectin content also depends on ripeness and variety. Overripe fruit contains less pectin than underripe fruit. Different cultivars of the same fruit may vary in pectin content—for example, Seville (bitter) oranges are high in pectin while sweet oranges are lower.
Fruits with moderate pectin levels include:
- Sweet apples
- Most grapes
- Oranges
- Papayas
- Peaches
- Apricots
- Kiwis
- Grapefruit
- Tangerines
- Rhubarb
How to Add Pectin to Jam
If you want reliable gel in jams made from low-pectin fruits, there are several options to increase or supplement pectin:
- Long-cooking method: Simmering the fruit and sugar for an extended time concentrates the mixture and breaks down cell walls, producing a natural thickening and a softer, more caramelized jam.
- Liquid pectin: Commercial liquid pectin is added to the hot fruit mixture to induce setting. It’s a faster method but works best when you follow a recipe formulated specifically for liquid pectin.
- Powdered pectin: Powdered pectin is typically mixed with the fruit before heating, then dissolved and combined with sugar. It yields a firmer, more consistent gel.
- Low-sugar pectin: Special commercial pectins are modified to set with less sugar. They require recipes designed for their particular formulation.
- Homemade pectin: You can extract pectin from high-pectin fruit parts (like apple peels and cores) to use when making jelly or to shorten jam-cooking time.
Commercial pectins are usually made from apple or citrus peel and produce a sturdier gel than many traditional, long-cooked jams.
How to Make Homemade Pectin
Many home cooks prefer a softer set and deeper flavor achieved by long-cooking jams rather than relying on commercial pectin. Some people also experience digestive sensitivity to commercial pectin products, and commercial powders can contain preservatives or additives. If you prefer to avoid those, homemade pectin is an easy alternative.
To make a simple homemade liquid pectin:
- Place 8 cups of apple cores, peels, or chopped tart apples in a large pot—tart apples work best.
- Add 2 cups (or just enough) of water to cover the bottom of the pan and partially submerge the apples without fully covering them.
- Bring to a boil, then reduce heat and simmer until the apples are soft and mushy.
- Strain the mixture through a jelly bag or a fine sieve to collect the clear liquid.
- The strained liquid is homemade pectin. For jelly, combine equal parts of this pectin liquid with your strained fruit juice; for jam, use it to reduce cooking time or to improve set.
With this basic understanding of pectin and a few simple techniques—long cooking, commercial pectin options, or homemade pectin—you can make well-set jams and jellies from a wide range of fruits. Check back later this month for more jam-making basics and practical tips!