For the meringue:

1. Mix the egg whites and sugar with a whisk, place the sugar mixture in a double boiler, and gently heat while constantly mixing.

2. Once the sugar is dissolved in the egg whites, transfer everything to a food processor.

3. At medium speed, whip the meringue until the bowl has cooled or the meringue forms firm peaks.

4. The meringue is shiny and ready to use. Reserve.

5. In the mixer, briefly soften the vanilla ice cream.

6. Add the meringue. It gives lightness and smoothness to your spoom.

7. To create the marbled effect: when serving, pour the grenadine syrup and mix with a spatula.