In a large stockpot, whisk together water, monkfruit sweetener, lemon juice, cream of tartar, cinnamon, and nutmeg. Add in chayote and ghee and bring to a boil over high heat.
Boil for 10 minutes, stirring occasionally.
Remove from heat. If using the mixture as filling for a baking project, set it until needed. Otherwise, transfer the mixture to an oven-safe dish and bake for 30 to 40 minutes at 350 degrees Fahrenheit.