Sprinkle gelatin on top of cold water and let it soak for 10 minutes.
Combine cream, sugar and salt in a medium saucepan. Add the gelatin mixture and bring to a simmer over low heat until the sugar and gelatin dissolves, about 7-8 minutes. Remove from the heat.
Add the extracts and sour cream, whisking until smooth.
Ladle into individual serving cups, cover and chill for at least 3 hours or up to 2 days.
Serve chilled with a dollop of lingonberry preserves on top, if desired.
Notes
Leftovers will keep in the refrigerator for up to 5 days.