Place cacao butter over a double boiler to gently melt the chocolate. If using a traditional double boiler, fill the bottom with water and place the top pot over it with the cacao butter already inside. Bring the water to a boil to produce the heat to melt the cacao butter. If you do not have a double boiler, simply fill a small to medium saucepan with water and bring it to a boil. Place a heatproof glass bowl with the cacao butter inside over the boiling water and heat until melted. Stir the chocolate occasionally to ensure an even melt. In the bowl of a stand mixer (or a medium sized mixing bowl and a hand mixer), combine room temperature cream cheese, sweetener (use the confectioner’s sugar variety), a pinch of salt, lemon juice and the zest together until creamy.
At this point, the melted cacao butter should be cool enough. With the mixer still running on medium speed, slowly drizzle in the cacao butter. Incorporate slowly and allow each bit to fully mix in before slowly adding the rest. It should be one homogenous mixture.
Use a teaspoon size cookie scoop to portion the fat bombs onto a parchment lined rimmed baking sheet. In the meantime, slice a lemon into 7 even slices. Place it into a small saucepan and fill it with enough water to just cover the lemon slices. Add the sweetener. Bring the mixture to a simmer and cook until the slices are softened about 5 minutes.
Remove the slices from the water and drain them in a strainer to remove any excess water. Since the sweetener is non-caloric and doesn’t add any additional carbs, add enough granulated sweetener in a bowl (about 3 tbsp) and press each lemon slice into the sweetener to coat it. You can use confectioner’s sugar sweetener too, it just will not have a crunchy coating.
Cut each slice into 4 equal sections and place one section on top of each fat bomb. Chill the fat bombs until firm. Store fat bombs in the fridge in an airtight container or in the freezer if you like extra cold treats.