Cut a sheet of parchment paper larger than the bread pan. Crumple and wet under water to soften it. Squeeze to remove excess water and place parchment paper in the bread pan to cover the entire surface.
Put the sugar in the mixing bowl. Pulverize 10 sec/speed 10. Reserve.
Weigh 50 g of this powdered sugar into the bowl. Add 500 g frozen strawberries and an egg white. Program Turbo mode and turn the speed selector 3 times. Scrape down the sides of the mixing bowl and mix 40 sec/speed 9 with the help of the spatula.
Position the butterfly whisk and program 10 sec/speed 4.
Put the strawberry sorbet in the bread pan, smoothing the surface with the spatula. Put in the freezer.
Rinse mixing bowl, weigh 50 g of powdered sugar reserved from step 2. Add 400 g frozen mangoes and an egg white. Program Turbo mode and turn the speed selector 3 times. Scrape down the sides of the mixing bowl and mix 30 sec/speed 9 with the help of the spatula.
Position the butterfly whisk and program 8 sec/speed 4.
Pour the mango sorbet over the strawberry mixture, smoothing the surface with the spatula. Put in the freezer.
Rinse mixing bowl, weigh 50 g of powdered sugar reserved from step 2. Add 300 g frozen cherries and an egg white. Program Turbo mode and turn the speed selector 3 times. Scrape down the sides of the mixing bowl and mix 20 sec/speed 9 with the help of the spatula.
Position the butterfly whisk and program 5 sec/speed 4.
Pour the cherry sorbet over the mango sorbet, smoothing the surface with the spatula.
Insert wooden sticks into the preparation as shown in the photos below. Put back in the freezer for at least 12 hours.
At the time of serving, unmold the popsicle terrine on a board and cut it into slices between the sticks.