Start by heating water over medium heat in a double boiler. If you don’t have a double boiler, you can use a glass mixing bowl set over a large pot. Just make sure the bowl doesn’t sit directly in the water— it should be above it.
Once the water is simmering, add the leaf lard, shea butter, and coconut oil to the bowl. Let them slowly melt together, stirring gently with a spatula until everything is completely dissolved.
Remove the bowl from the heat and let it cool slightly. You want it to be warm but not too hot.
Once the mixture has cooled a bit, start mixing it with a stand mixer with a whisk attachment or hand mixer. A stand mixer is easier, but a hand mixer works too. Start on low speed and slowly increase it as the mixture cools. This will take about 10-15 minutes. The lotion will start to form soft peaks and turn milky white.
When the lotion has soft peaks, add 20 drops of the essential oils of your choice. Don’t add them while the lotion is still too hot because they might evaporate.
After adding the essential oils and mixing, remove the bowl from the mixer. Transfer the lotion to an amber glass jar and let it cool completely. Store your lotion in a cool, dry place. It should last around 2-3 months.