German Plum Freezer Jam (Zwetschgen, No Pectin)
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This easy German Plum Freezer Jam is made with Zwetschgen — what we call Italian plums in Germany, technically a type of prune plum — simmered with sugar and lemon juice until thick and glossy, then frozen in individual containers instead of canned. No pectin, no fuss, and every spoonful tastes like late summer.
I’ve completely switched over to freezer jam, and I don’t think I’m going back. Canned jam always tasted a little muted to me — like something got lost between the pot and the jar. Freezer jam tastes so much more like fruit straight off the tree. With less sugar getting in the way, that sweet-tart Zwetschgen flavor really gets to shine.
Why You’ll Love This Recipe
- Simple ingredients — just Zwetschgen and sugar and lemon juice
- No pectin and no canning equipment required
- Freezer-friendly, so it’s ready whenever you need it
- Tastes noticeably more like fresh fruit than canned jam, with less sugar
- A true taste of German Zwetschgen jam, made simple
What Are Zwetschgen?
Zwetschgen are small, oval, deep-purple plums commonly used throughout Germany and much of Europe. In the U.S., you’ll usually find them labeled as Italian plums or prune plums. They’re denser and less juicy than round American plums, which makes them especially good for jam: less water to cook off, and a rich, slightly tart flavor once sweetened.
Ingredients You’ll Need
Zwetschgen (Italian plums): fresh, ripe Zwetschgen, washed and pitted – no need to chop, they break down on their own as they cook.
Sugar: This is on the lower side compared to many plum jam recipes, which lets the natural tartness of the Zwetschgen come through.
Lemon juice: Adds a little brightness and balances the sweetness of the jam.
How to Make German Plum Freezer Jam
1. Prep and macerate. Wash the Zwetschgen and remove the pits — no need to chop them, they break down on their own as they cook. Combine the plums with the sugar in a large bowl or pot, stir to coat, and let sit for about 2 hours at room temperature. This draws out the natural juices and gives the jam a better texture before it ever hits the stove.
2. Simmer. Transfer the macerated plums and their juices to a large pot. Stir in the lemon juice and bring to a boil, then reduce the heat and simmer for about 20 minutes, stirring occasionally.
3. Blend partway through. Around the 10-minute mark, use an immersion blender to blend the jam right in the pot for a few seconds. This breaks down the plums further and helps the jam thicken noticeably better than simmering alone. Continue simmering until the jam has thickened and reached the consistency you like.
4. Cool in the pot. Remove from heat and let the jam cool completely in the pot before transferring it — this helps it finish thickening and makes it much easier to portion.
5. Portion and freeze. Once cooled, ladle the jam into freezer-safe containers, leaving about 1/2 inch of headspace at the top for expansion. Label each container, then freeze.
💡 Debbie’s Tip
Use an immersion blender around the 10-minute mark. A quick blend right in the pot helps the German plum freezer jam thicken noticeably more than simmering alone.
Equipment You’ll Need
• Freezer-safe containers: I use these for portioning the jam into single servings — sturdy, don’t crack in the freezer, and stack neatly.
• Labels: Worth doing before the containers go in the freezer, not after — a lot easier to write on than frozen plastic.
❄️ Storage & Freezing
This is a freezer jam, not a shelf-stable canned jam. Do not store it at room temperature. For shelf-stable canning, use a tested canning recipe with the proper fruit-to-acid ratio and processing time.
- Store the jam in the refrigerator for up to 3 weeks.
- Freeze for up to 1 year in freezer-safe containers.
- Leave about ½ inch of headspace so the jam has room to expand as it freezes.
⚠️ Important
This recipe is intended for freezer storage only. It has not been tested for shelf-stable canning. For safe canning, always use a tested canning recipe with the proper fruit-to-acid ratio and processing time.
Frequently Asked Questions
Can I can this instead of freezing it?
This particular batch was made and stored as a freezer jam, not processed for canning. It does include a small amount of lemon juice, but that amount alone isn’t a substitute for a tested, canning-safe ratio of acid to fruit – if you want a shelf-stable, canned version, follow a tested canning recipe’s lemon juice ratio and proper water-bath processing times. As written, this recipe is for the freezer only.
Do I need pectin for this jam to set?
No. This jam thickens naturally as the fruit cooks down and excess moisture evaporates, so there’s no need to add commercial pectin.
Can I use regular round plums instead of Zwetschgen?
Yes, though the texture and tartness will be slightly different. Zwetschgen are denser and less watery, so regular plums may need a few extra minutes of simmering.
More Recipes You’ll Love
→ Rote Grütze – German Berry Dessert
German Plum Freezer Jam (Zwetschgen, No Pectin)
Ingredients
- 4 kg Zwetschgen (Italian plums), washed and pitted about 8¾ lbs
- 4 cups white sugar
- 2 tablespoons lemon juice
Instructions
- Wash the Zwetschgen and remove the pits — no need to chop, they break down on their own.
- Combine the plums and sugar in a large bowl or pot and let macerate at room temperature for about 2 hours.
- Transfer to a large pot, stir in the lemon juice, and bring to a boil.
- Reduce to a simmer and cook for about 20 minutes, stirring occasionally. Around the 10-minute mark, blend briefly with an immersion blender right in the pot to help the jam thicken.
- Remove from heat and let the jam cool completely in the pot.
- Ladle into freezer-safe containers, leaving about ½ inch of headspace. Label and freeze.
