Here's a recipe for a sugar-free mooncake filling:

Low-Carb and Sugar-Free Mooncake Filling Recipe

Ingredients:

* 1 cup of unsweetened almond butter or sunflower seed butter
* 1/2 cup of granulated sweetener (such as Swerve, Erythritol, or Monk Fruit Sweetener)
* 1/4 cup of coconut oil
* 2 large eggs
* 1/2 teaspoon of salt
* 1 teaspoon of vanilla extract
* 1/2 cup of chopped nuts (such as almonds or walnuts)
* 1/4 cup of shredded coconut (optional)

Instructions:

1、In a medium-sized bowl, mix together the almond butter, granulated sweetener, and coconut oil until smooth.
2、Add in the eggs, salt, and vanilla extract, and mix until well combined.
3、Stir in the chopped nuts and shredded coconut (if using).
4、Cover the bowl with plastic wrap and refrigerate the mixture for at least 30 minutes to allow it to firm up.
5、Once the mixture has firmed up, use a small cookie scoop or your hands to shape it into small balls, about 1 inch in diameter、You should end up with around 12-15 balls.
6、These filling balls can be used immediately, or stored in an airtight container in the refrigerator for up to a week.

Tips:

* You can adjust the amount of sweetener to your taste.
* If using a sugar substitute that contains xylitol, be aware that it can cause digestive issues in some individuals.
* You can also add other ingredients to the filling, such as cinnamon or cocoa powder, to give it a different flavor.
* To make the filling more cohesive, you can add a small amount of coconut flour or almond flour.

Sugar-Free Mooncake Filling Variations:

* Lotus Seed Paste Filling: Add 1-2 tablespoons of lotus seed paste to the mixture for a more traditional mooncake flavor.
* Red Bean Paste Filling: Add 1-2 tablespoons of sugar-free red bean paste to the mixture for a classic mooncake flavor.
* Coconut and Macadamia Nut Filling: Add 1/4 cup of shredded coconut and 1/4 cup of chopped macadamia nuts to the mixture for a delicious and tropical flavor.

Using the Filling in Mooncakes:

* To assemble the mooncakes, simply place one of the filling balls into a mooncake mold or shape it into a ball and wrap it with a piece of dough.
* Make sure to press the filling into the center of the dough and seal the edges well to prevent the filling from escaping during baking.

Enjoy your sugar-free mooncakes!