- Preheat oven to 180 degrees celsius.
- Cream butter with sugar; beat in egg yolk, orange and lemon peels and lemon juice.
- Mix in flour, ground almonds and salt, mixing until just blended. Form into 1 inch balls.
- Beat egg white with fork until frothy.
- Dip balls into egg white, then into chopped almonds.
- Place on ungreased baking tray.
- Press whole almonds into centre of each to flatten.
- Bake for 10 minutes, or until lightly browned.
- Cool on wire racks.