Buckwheat brownie over water chestnut tart Recipe

And i swear this is the first time i work with something other than refined flour which scares the hell out of me. And being from south india this is the first time i am either seeing these flours or tasting it. After a huge thought decided to make this as both tart and brownie does not need much of gluten help. And by tasting raw flour i got, chestnut flour is more nutty in flavor hence its tart and buckwheat for brownie . And the huge experiment is totally worth it with taste and texture.