Strawberry & Rhubarb Jam

Strawberry rhubarb jam without store-bought pectin sounds like a gamble until you spot the secret ingredient: a whole unpeeled orange, seeds removed, ground or finely chopped into the pot. The pith and peel carry enough natural pectin to set the jam without packets, and the citrus oils brighten the strawberry flavor in a way no commercial gel can match.

Crush the strawberries only slightly before measuring. You want pieces of fruit you can identify on toast, not purée. The rhubarb goes in raw, cut into half-inch pieces so it breaks down to the same softness as the berries during the hard boil.

The cook is fast and aggressive. A wide heavy-bottomed pot lets steam escape so the jam thickens through evaporation rather than overcooked sugar. Twelve to fifteen minutes of a rolling, hard boil is usually all it takes. Look for the jam to sheet off a cold spoon rather than drip in two thin streams. Skim the foam, stir for five minutes off heat to suspend the fruit evenly, then can in sterilized jars.

Pro Tips

• Test the set with a chilled saucer in the freezer. Drop a teaspoon of jam, wait one minute, then push it with a finger. If it wrinkles, it’s done.
• Skim foam diligently. It cans cleanly but looks cloudy if left.
• Stir for the full five minutes after pulling from heat to prevent fruit from floating to the top of the jar.
• Use frozen fruit straight from the bag in winter. The pectin and acid behave the same as fresh.

Variations

• Add a split vanilla bean during the boil for a softer, dessert-leaning jam.
• Swap the orange for a Meyer lemon to push the citrus brighter.
• Stir in a tablespoon of grated fresh ginger for warmth against the rhubarb tang.