Preheat the oven to 190C/375F/gas mark 5
Use a 900g/2 lb loaf tin.
Line and grease the loaf tin. Cream together the butter and sugar. Gradually add the sour cream. Fold in the sifted flour with baking powder. Mix together, juice, rind and milk. Add to flour mixture, beating well. Turn into prepared tin and bake for 40-45 minutes. Turn out and cool on wire rack.
Mandarins or tangerines could be used in place of oranges. Orange juice and milk mixed together may curdle, but do not worry because it does not affect the texture in any way.
