Make the simple syrup by combining the water and monk fruit sweetener in a small pan, Cook over medium heat until the sugar dissolves, about 6 minutes. Set aside and let cool or add ice cubes if in a hurry.

To a cocktail shaker, add a handful of ice along with the tequila, lime juice, and simple syrup. Shake well for 20 seconds and give it a taste, you may want more sweetness. Adjust, shake again, and serve in a glass.

To make the horchata margarita, add ice to a cocktail shaker along with the tequila, lime juice, simple syrup, coconut milk, and cinnamon. Shake well and give it a taste, you may want more sweetness or coconut milk. Adjust, shake well, and serve.