Juice and grated or finely chopped rind of 1 orange
A handful of roughly crushed pecans or walnuts
Lightly grease a 9x9 inch baking tin and line with baking parchment. Preheat the oven to 180 degrees C.
In a large bowl, mix together the flour, oats, salt, sugar, coffee powder, soda bicarb and cocoa.
In another bowl, gently whisk together the buttermilk(or milk with vinegar) and oil. Pour into the dry mixture and mix until just combined, taking care not to overmix, else the baking soda will go flat. Now add the orange juice and rind, and sprinkle the pecans on top.
Pour into the prepared tin and bake for 20 minutes or until an inserted toothpick comes out clean. Leave brownies to cool completely in the tin before slicing.