Preheat oven to 350F and line an 8x4 baking loaf with parchment paper.
In a large bowl, whisk together almond flour, tapioca flour, baking soda, salt and lemon zest.
In a smaller bowl, whisk together eggs, butter, honey and vanilla extract. Add wet mixture to dry and stir to combine. Add in blueberries.
Pour batter into loaf pan and bake 35-40 minutes. Cool completely. ( Fit Mitten Kitchen recommends covering with aluminum half way through, but I didn't have any! I also went a little 40 min because my cake tester wasn't coming out clean, and eventually just pulled it anyway, and once it cooled I found it was in fact completely cooked!)
For the Candied Lemons
Bring water and honey to a boil and gently add lemon slices. Simmer for 12-15 minutes.
Remove from heat and place on a baking rack to cool completely.
For the Coconut Butter Glaze
Whisk together all ingredients. Set aside.
To Assemble:
Drizzle coconut butter glaze on top of loaf. Top with candied lemon slices and blueberries. Allow for glaze to set.