2,5 kg lingonberries
2 l water
25 g lemon or wine acid (can be found from your local pharmacy)
500 g sugar for each liter of juice

Clean and crush the berries. Melt the acid into water, then add the crushed berries. Mix well and keep still for 1-2 days. Run the mixture through a strainer, and add sugar. Pour the juice into bottles and store in a cool place. For an adult version, add a tad of vodka before serving.