Lavender Blueberry Bliss Jam

Why This Lavender Blueberry Bliss Jam Works

As the blueberries heat with the sugar and lemon juice, they start to burst and let out their juice. The sugar melts into that juice, so everything turns into a deep purple syrup instead of loose berries and dry sugar. Over time, the water in the blueberries slowly cooks off, and the natural pectin in the fruit has less liquid to float in. The jam thickens and goes from runny to glossy and spoonable.

Once the lavender goes in and the pot comes to a boil, the dried buds soften and their taste slowly seeps into the hot blueberry syrup. Simmering instead of hard boiling keeps the blueberries from burning on the bottom and gives the jam time to tighten up without turning harsh. Near the end, the heat is off when the vanilla is stirred in, so it stays smooth and gentle instead of cooking away. As the jam cools in the jars, it firms up even more, so it spreads nicely instead of sliding right off the toast.

Mistakes To Avoid

Letting the jam boil hard the whole time can scorch the bottom before the berries have a chance to thicken properly. The sugar sticks to the hot pot, dark spots form, and that burnt layer mixes in when stirred, giving the whole batch a harsh, bitter edge and a slightly gritty feel.

Adding way too much lavender turns the jam harsh and almost soapy. The small amount of heat and liquid pulls out strong oils from the flowers, and instead of a light floral note, the whole jar tastes like perfume and can be hard to eat.

Skipping the simmer time and stopping as soon as the berries soften leaves the jam runny. The liquid doesn’t have time to cook off, so it looks thick in the hot pot but sets up in the jar more like a sauce than a spread.

Stirring in the vanilla while the jam is still at a full boil causes most of the aroma to steam off right away. The final jam ends up with barely any vanilla note, even though it was added.