In a proper bowl sieve the sugar

Add the rest of the ingredients and blend it in a food mixer

To have a proper shape:
Add the mixture in a pipping bag and form flower shape or as preferred

Leave the flowers to dry for 6hours or overnight

Notes:
-you can keep the royal icing in a sealed container for up to two weeks
-for better result make sure to use plates free from fat products
-you can add food colouring.