Lingonberry sauce can be used like cranberries. In Newfoundland, lingonberries are called partridge berries. Some of my favorite things to do with lingonberries include:
1-Add to the gravy when making a venison roast (or beef--traditionally, this would be reindeer roast, but I have a hard time finding reindeer roasts)--so, add 1-2T lingonberries, about 5-6 T grated Gjetost, and use cream or half-and-half. Amazing gravy.
2. Add 2 grated jalapeno peppers, onion, cilantro to it and make lingonberry salsa.
3. In Newfoundland, they sell canned partridge berry pie filling. Makes an amazing pie.
Other ways to eat it, on toast, on pancakes, on muffins. You can also mix it in to the muffin batter.