In a medium saucepan, add agar-agar and water and stir well.
Add granulated sugar one and fruit puree.
Cook over medium heat. As soon as it starts boiling, set the timer for 5 minutes. Continue cooking syrup, whisking a few times. The syrup should be thicker after 5 minutes of boiling. Remove from heat.
In a mixing bowl with a whisk attachment, add egg whites and beat on low speed until foamy.
Add sugar 2 and start whipping on medium-high speed.
Whip the meringue until soft peaks form.
Slowly pour the sugar syrup into the meringue, while the mixer runs on medium-high speed. Do not pour syrup into the whisk, aim it toward the side of the bowl.
When all the syrup is poured in, increase the speed to medium-high and whip for 2 minutes.
Immediately transfer the mixture into the prepared piping bag.
Pipe 2-inch round rosettes on the prepared baking sheets.
Let Zephyr set for 4-5 hours or overnight.
Dust with powdered sugar, and enjoy!
Notes
The syrup should be at 217oF-221oF (103oC-105oC) if you want to check with a thermometer.