Chickpea flour and pistachio shortbread diamonds

Directions

1. Cook the chestnut over low heat, stirring constantly, until it is slightly darker and no longer has a raw or moist texture. ⏱ ≈ 40 min
2. Sift the flour to break up any clumps that may have formed during roasting. ≈ 10 min
3. Melt the butter in a frying pan, add the sifted flour and cook over low heat until it turns a light brown. Taste occasionally to prevent it from becoming bitter or burning. ⏱ ≈ 40 min
4. Pour, the mixture into a large bowl, add the powdered sugar, cinnamon, and cardamom, and mix until a smooth dough forms. If it remains sandy, add the oil gradually. ≈ 4 min
5. Bring the dough together by hand, place it on a sheet of parchment paper, cover with another sheet, and roll it out to a thickness of 5 mm. ≈ 3 min
6. Remove the top layer, sprinkle with chopped pistachios, and gently press them into place. Refrigerate for 1 hour, then cut into diamond shapes. ⏱ 1 hr
7. Store the rhombuses in an airtight container or in the refrigerator. ⏱ ≈ 2 hr