Wash the lingonberries thoroughly and remove any stems or leaves.

In a bowl, combine the washed lingonberries and sugar.

Using a fork or potato masher, gently crush the lingonberries and sugar together until the berries are well mixed with the sugar and some juice is released.

Taste and adjust sugar to your preference.

Let the mixture sit for a few hours or overnight in the refrigerator to enhance the flavor.

Serve as a side dish or condiment with meats, desserts, or on toast.