Preheat the over, grill in the center at 200° C (400° F)
In a saucepan bring to boil 375 ml of water.
Add the quinoa, using a spoon, stir and let cook 20 minutes over low heat. Reserve in a bowl and let cool.
In a bowl, in a water bath or microwave, melt the chocolate and butter.
Mix quinoa and cocoa powder. Then add this mixture to the chocolate preparation obtained before. You need to get a smooth homogenous mixture.
In a bowl, whisk the eggs, and then stir the sugar until you get a light and fluffy result. Add in the orange zest and salt.
Stir the mixture preparation obtained in the prepared chocolate.
Butter and add lightly flour a cake pan. Pour the preparation in the pan and bake in the oven 25 minutes.
Once cooked, unmold and cut into portions.