In a large mixing bowl, combine flour, sugar, baking powder, salt, and lemon rind. Cut in butter until mixture is crumbly in texture. Beat eggs with milk and add to flour mixture. Blend until just moistened. Do not over mix. Add raisins and coconut and mix again, just enough to incorporate. Using an ice-cream scoop or tablespoon, portion dough onto a greased cookie sheet. Brush the tops of each bun with beaten egg whites and sprinkle with sugar.
Bake for about 25 minutes. Buns should be golden brown and firm to touch.
