I use a fruit sweetened sour cherry jam as the center icing. (forestandfauna.com)
The ones here are soft for sure, but they're also dark and nutty and rich, with a thick layer of sour cherry jam slathered right in the middle. (kitchenwindowclovers.com)
cake cherry jam coconut oil coffee coffee cake company honey jam maple syrup no refined sugar sour cherry jam yogurt (nutritionnaire.com)