Cut butter into flour.
Combine egg yolk and sour cream and blend into flour mixture.
Chill several hours or overnight.
Divide dough into 4 portions roll each into a 10" circle.
Spread 2T. of preserves, sprinkle with 2 T. of coconut and 1 T. of nuts.
Cut each circle into 12 wedges.
Roll each edge from large end.
Sprinkle with sugar.
Bake at 350 for 20 mins.