Mix the white and pink sanding sugars together in a small dish- set aside. Place the lemon juice in a saucer or rimmed plate.
Roll the frozen fruit in the egg white or simple syrup. Roll the fruit in the sugar. Set on a clean plate and freeze for 5 minutes.
Dip the rim of your champagne glass in the lemon juice. Then dip the rim into the sugars. Add two or three berries to the glass taking care not to disturb the rim. Pour in 1 teaspoon of Chambord. Top with champagne.