Preheat oven to 325°F. Line a baking sheet with a silicone baking mat, or parchment paper, and set aside.
In a large mixing bowl, whisk together the melted coconut oil, maple syrup, vanilla, lemon zest, and lemon juice.
2 tablespoons coconut oil, melted, ¼ cup pure maple syrup (room temp), 1 teaspoon pure vanilla extract, 1 tablespoon packed lemon zest, 3 tablespoons fresh lemon juice
Add the almond flour, cassava flour, baking soda, and salt to the wet ingredients. Mix until fully combined.
1 ½ cups (150g) almond flour, ½ cup (65g) cassava flour, ½ teaspoon baking soda, ¼ teaspoon fine sea salt
Using a 2-tablespoon spring-loaded cookie scoop (or spoon), scoop 2 heaping tablespoons of dough onto the prepared cookie sheet for each cookie, spacing 2 inches apart. Get your hands slightly damp and press each dough ball down into a round cookie shape (I like mine to be ¼"-⅓" thick). The cookies won't spread as they bake (see notes).
Bake for 11-13 minutes, or until the centers are set and the edges are just beginning to brown. Remove from oven and allow cookies to slightly cool and then transfer them to a cooling rack to cool completely.