Create a syrup with water and sugar bringing them up to 121 ° C.
Pour the syrup continuously into the egg whites and let the planetary mixer turn until the mixture cools.
Form the meringues on a baking sheet lined with parchment paper and bake for 1 hour and a half hours at 90 ° C, then open the oven door a few centimeters and finish cooking with another 30 minutes.
Leave them in the oven off until cool.(the meringue doesn't have to cook, it just has to dry)