Combine flour and salt and the zest of the lemon in a small bowl and whisk until well combined.
In a separate bowl, add the scoop of stevia to the sugar and whisk it well. Carefully peel the lemon and remove the seeds, saving as much of the juice and pulp as you can.
Puree the lemon in a food processor or mash it in the sugar with a fork until well blended using the pulp and the juice., then add the butter (or coconut oil). Once those are well combined, add the flour and mix well.
Use a small teaspoon or cookie scoop to make 10-12 one inch dough balls and place onto an ungreased cookie sheet 1-2 inches apart. Bake for 10-12 minutes or until golden on the edges.