This small-batch rhubarb jam comes together with just three ingredients—fresh rhubarb, sugar, and lemon juice—and no pectin needed. It’s tart, deeply flavored, and thick enough to hold its shape as an ice cream swirl without bleeding into the base. It also works beautifully on yogurt, scones, or as the filling in Happy Marriage Bars.
The recipe makes about 2 cups, more than enough to swirl through three pints of ice cream with a good chunk left over for the fridge.
Why I Started Growing Rhubarb (And Why I Refuse to Stop)
Rhubarb is one of those flavors people either love immediately or come around to slowly. I was immediately a convert. I bought my first plant in 2019, and when we moved in 2023, I dug her up and brought her with me. She resurrects from the dead every spring, and as a former black thumb, I am committed to protecting her with my life.
My favorite low-effort use for it is a simple rhubarb syrup stirred into cold seltzer on a warm afternoon. But this jam has become its own obsession, and it started with a recipe I’d been eyeing for years: Happy Marriage Bars. I first heard about them about a week after we got home from our honeymoon in Iceland (a total missed opportunity). But when I finally made them this year, I had some leftover rhubarb jam, and I was already planning a batch of pistachio ice cream—it was kismet. My husband wasn’t so sure about the pairing, but he ate his words (literally) when he tasted the tart-and-nutty combination.
Why This Jam Doesn’t Need Pectin (And You Don’t Need to Be a Canning Expert)
I’m admittedly a jam-making novice—I don’t gave a canning setup, I have no idea where to buy pectin, and I have to look up the right temperature every time. But this rhubarb jam recipe eliminates two of those three variables (sorry, you still have to know the right temp!). We’re not making a shelf-stable preserve here; just a fresh jam that lives in your fridge or freezer and gets used up quickly.
Rhubarb is naturally high in pectin, which means it has most of what it needs to set on its own. The acid in lemon juice activates it, sugar concentrates it, and heat does the rest.
The one thing you do need is a thermometer. For rhubarb jam without pectin, temperature is everything, and 224°F is your finish line. Hit that number, and you’re done. Pull it too early and the jam stays loose; push it too far and it sets too firm. But with a thermometer in hand, there’s almost no way to get it wrong.
3-Ingredient Rhubarb Jam
Ingredients
- 454 g rhubarb (1 lb, chopped)
- 454 g cane sugar
- 28 g fresh lemon juice (2 tbsp)
Equipment
- Saucepan
- Instant-Read Thermometer
- Immersion Blender
Method
- Add 454 g rhubarb, 454 g cane sugar, and 28 g fresh lemon juice to a medium saucepan.
- Heat over medium-high and stir continuously. The sugar will begin to melt within 2–3 minutes as the rhubarb releases its liquid.
- Stir until all of the sugar has melted.
- Once the sugar has fully melted and the mixture is liquid, reduce the heat to medium and stir frequently. It will begin to bubble and foam.
- Check the temperature frequently with an instant-read thermometer. Once the mixture reaches 224°F, immediately remove it from the heat. This takes about 20–25 minutes total from when you started.
- Blend with an immersion blender until smooth and glossy, or leave it chunky if you prefer texture.
- Pour into a heatproof container and cool at room temperature for at least 1 hour, then transfer to the refrigerator to chill completely before using.
Notes
- Fresh rhubarb varies widely in color, but not in flavor. Field-grown rhubarb tends to be greener and will give you a more muted, earthy-pink jam. Garden rhubarb with redder stalks gives a deeper, rosier result.
- Don’t be alarmed when the mixture looks impossibly dry at first. The sugar will melt, and the rhubarb will break down quickly once it hits the heat.
- For a jam that holds its shape as an ice cream swirl, cook it to 224°F. This is intentional, so you have a nice, thick jam with very low water content.
- Blending after cooking gives you a smooth, glossy swirl that ribbons cleanly through ice cream. If you prefer a chunkier texture, you can skip it.
- Let it cool to room temperature before refrigerating, and chill it completely (overnight is ideal) before using it as a swirl. Warm jam will melt into your ice cream rather than staying distinct. Cold jam holds its shape.
- Ways to use rhubarb jam: swirl into homemade pistachio or vanilla ice cream, spread on sourdough toast, spoon over Greek yogurt or oatmeal, use as a filling in Happy Marriage Bars, or layer into a thumbprint cookie.
