Ingredients
Equipment
Method
Cook the jam
- Combine diced fresh rhubarb, vanilla bean pod and seeds, and lemon juice in a large pot. Stir to distribute the vanilla seeds throughout, creating a pink base with visible flecks.
- Stir in powdered pectin and bring the mixture to a rolling boil over medium-high heat, stirring constantly for steady bubbling. Keep it at a vigorous boil so the mixture thickens and looks glossy.
- Add the sugar all at once and return to a hard boil for 1 minute, stirring constantly. The jam should bubble rapidly and look clear-to-amber around the edges before it thickens.
- Remove the pot from heat, skim off any foam, and remove the vanilla bean pod. The jam should be smooth and ruby-pink with suspended vanilla bean flecks.
Jar and set
- Ladle the hot jam into sterilized half-pint jars, leaving 1/4-inch headspace. Wipe jar rims clean so the lids seal properly.
- Process the filled jars in a boiling water bath for 10 minutes. Keep the water at a true boil with jars fully covered for safe canning.
- Let jars sit undisturbed for 24 hours to set completely. The jam will firm into a thick, spreadable texture with a spoonable gel.
Notes
Pro tip: Use fresh rhubarb that’s firm and bright red/pink at the edges so your jam turns a deeper ruby tone. Refrigerate opened jars up to 3 weeks; unopened, properly canned jars store in a cool dark place for up to 1 year (follow safe canning practices). Freezing is possible, but for best texture and set, freeze jam in containers and thaw in the fridge rather than canning; it may be softer after thawing. For a lower-sugar variation, consider a low-sugar pectin product and a tested recipe ratio instead of substituting normal sugar 1:1.