


In a large bowl, whisk together flour, soda, powder and salt.
Cut in the butter with your fingers until grainy, like cornmeal.
Make a well in the center and fill with 1 egg and sour cream.
Mix in with a fork until the dough comes together.
Turn out onto a floured board and knead slightly until smooth.
Roll into a log and cut into 8 triangles and place on an ungreased cookie sheet.
Gently wash the tops of the scones with the remaining beaten egg and sprinkle with coriander.
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