make egg white royal icing on the soft side (not all the sugar)
find a sphere of the size you need (a balloon is OK)
grease sphere lightly with vegetable shortening
pipe parasol of your choice
remove substrate (let air out of balloon, DO NOT pop it)
Thank you. The balloon is a great idea!
I'd use something solid, sturdy, and stable that you can steady similar to a ball pan.
These directions are similiar. hth