Turn on the oven to 350 degrees.
In a food processor, add in the almond flour, arrowroot, sugar, baking soda and salt.
Pulse until combined. (If you don't have a food processor, mix together.)
Add in the cubes of butter and pulse until they are about the size of a small pea. (You can do the same thing with a fork or pastry cutter, it just takes a little work.)
Next, add in the egg and the lemon zest and juice.
Pulse until it starts to come together and for a ball.
Remove the dough with your hands and place half of the dough in a bowl. Set the other half aside.
Add in half the blueberries and gently fold them in. The dough will most likely turn a little blue, but that's ok!
Take this dough and on a pan lined with parchment paper, make pat the dough into a six inch round or so.
Repeat with the other half of the dough.
Using a pizza cutter, cut each round into eight pieces (not separating) and bake for about 20 minutes.
Remove and using a spatula, separate the triangles and return to oven for another 5-10 minutes or until golden brown.
Remove and allow to cool on a rack. Enjoy!