Heat butter in a saucepan and sauté 1 tbsp of diced onion, about 3-5 minutes.
Add heavy whipping cream and bring to a light simmer, do not boil.
Add fresh chopped dill to the sauce along with salt and pepper.
*If your sauce isn't thick enough to your liking, you can add xanthan gum* to help thicken the sauce. About 1/8 tsp.
Pour sauce over the cooked beet leaf rolls.
Enjoy!