If you grow kumquats, you probably know how prolifically they fruit! These tiny, tangy citrus gems often produce more than you can eat fresh, making them perfect for preserving. Making kumquat jam is one of the best (and most delicious) ways to enjoy your homegrown harvest throughout the year. This easy kumquat jam recipe is a simple, low-waste method that uses natural pectin from the seeds and minimal ingredients—just fruit, water, sugar, and lemon.
Whether you’re new to preserving or a seasoned jam maker, this recipe is a great way to use up a bunch of kumquats and create something delicious to enjoy or gift to friends and family.
Why You Should Try Making Kumquat Jam
Kumquats are a unique grape-sized citrus fruit with edible skins and a sweet-tart flavor that works beautifully in jams and marmalades. Unlike many other citrus fruits, kumquats can be eaten whole, which means their zest, juice, and skin all contribute to flavour-packed, easy-to-make preserves. This homemade kumquat jam is vibrant, tangy, and great for using in other recipes like my delicious Kumquat Jam and custard scrolls! (a must try)
Another bonus? You don’t need to buy pectin. Kumquat seeds contain natural pectin, which helps the jam set—so this is a great way to make a more natural jam using what you already have.
Simple Ingredients for Homemade Kumquat Jam
- 4 cups chopped kumquats (seeds reserved)
- 5 cups water
- 1½ cups sugar
- ½ lemon (juice)
Kumquat Jam
Kumquat jam is a great way to use and preserve your harvests. Add this jam to pikelets or baking for a delicious citrus flavour.
Ingredients
- 4 cups chopped Kumquats
- 5 cups of water
- 1 1/2 cups sugar
- 1/2 lemon
Instructions
Wash and chop your Kumquats and keep the seeds as you will need them to use as natural pectin.
Place the Kumquats and water in a pot.
Get all your seeds and make a little bag from cheesecloth or in a strainer. You want the seeds to be submerged in the water but not dispersed throughout as you will be discarding them later. Let the seeds and kumquats sit in the water for 4hrs to release the natural pectin. Remove the seeds and discard.
Place a saucer or plate in the freezer to test your jam out at the end.
Bring the pot to a simmer for 30mins. Add in the sugar and stir. Bring the pot to boil for 5min.
Test your jam by putting droplets onto your frozen plate. They should thicken as you run the end of a spoon through the droplet to check. If it doesn't look like it is set add some fresh lemon juice, reheat, and stir. Test again. I repeated this a couple of times and it started to look set.
Spoon hot mixture into hot jars (heat mine in the oven to sterilise 120 degrees for 15 mins and the lids in a bowl of boiling water).
Turn the jars upside down to cool and help the lids seal.
Refrigerate and enjoy.
How to Make Kumquat Jam (Step-by-Step)
1. Prep Your Kumquats
Wash your kumquats thoroughly. Chop them up and be sure to collect the seeds as you go. You’ll need the seeds later to extract the natural pectin that helps the jam thicken.
2. Create a Pectin Bag
Place the chopped kumquats and water into a large pot. Take your reserved seeds and place them into a small cheesecloth bag or a metal strainer. This step is important—you want the seeds to soak in the water but not disperse throughout the jam, as you’ll be removing them later.
Let the pot sit for around 4 hours at room temperature. This resting time allows the seeds to release their pectin into the water naturally.
3. Remove Seeds & Begin Cooking
After 4 hours, remove and discard the seeds. Place a small saucer or plate in your freezer (this will help you test if the jam is set later).
Bring your pot of kumquats and water to a simmer and cook for 30 minutes. Then stir in the sugar and bring the mixture to a rolling boil for 5 minutes.
4. Test for Set
Remove your plate from the freezer and spoon a few drops of the jam onto the cold surface. Wait a few seconds, then run the edge of a spoon through it. If the jam wrinkles or holds its shape, it’s ready. If not, add the juice of ½ a lemon, stir, and boil for another minute or two. Repeat the test until the jam is set.
5. Jar Your Jam
Sterilise your jars ahead of time by placing them in a 120°C (250°F) oven for 15 minutes. Soak the lids in boiling water. Once your jam is ready, spoon the hot mixture into the hot jars and seal them while hot. I like to turn my jars upside down as they cool to help them seal.
How to Store Your Kumquat Jam
Once cooled, store your jam in the fridge. Properly sterilised and sealed jars can last several months in the fridge or a cool pantry. Opened jars should be used within a few weeks.
Delicious Ways to Use Kumquat Jam
- Spread on toast or scones
- Swirled into yogurt or porridge
- As a glaze on roast vegetables or meats
- Paired with cheese on a grazing board
- Layered in cakes or desserts
Making your own jams/ preserves is a rewarding way to reduce waste, use seasonal fruit, and add something homemade and flavourful to your pantry. If you’re growing kumquats, give this small-batch kumquat jam recipe a try. You’ll love the sweet, tangy flavor and the satisfaction of creating a garden-to-table treat with your garden’s harvest.
Want more tips on how to grow kumquats? Check out this grow guide.
