If you're using fresh lingonberries, remove any stems or leaves and rinse them. If you're using frozen berries, let them thaw first.
Place the berries and water in a saucepan. Bring the mixture to a boil. Add the sugar when the berries begin to burst and release their juice. Stir until the sugar is completely dissolved.
Let simmer over medium heat, stirring occasionally for 10-15 minutes. The lingonberries will break down and the mixture will thicken slightly.
As the jam simmers, a foam might form on the surface. Skim this off with a spoon for a clearer jam.
Transfer the hot jam to sterilized jars. Seal and store in the refrigerator for up to one month.
Notes
The amount of sugar can be adjusted based on how tart or sweet you want your jam to be.If you are serving your lingonberry jam with pancakes or some dessert, you can add as flavor one cinnamon stick and one teaspoon of vanilla sugar.Lingonberry jam is traditionally served with swedish meatballs, cabbage rolls, liver dishes, reindeer or elk stew, savory potato pancakes and with other pancake variations like spinach pancakes and nettle pancakes. Try lingonberry jam also with your breakfast porridge. This jam stores for 1-4 weeks in the fridge, but if you choose to use proper jam-preserving and canning techniques and well-sterilized jars, it can store for months.