Peel the potatoes and carrots, wash them and cut them into equal cubes.
Fill a pot with plenty of water, bring it to a boil, add salt and boil all the vegetables for about 10 minutes.
Drain and cool them quickly in the Freddy® with the blast chilling function for about forty minutes.
While the vegetables are cooling, prepare the mayonnaise: pour the milk and lemon juice into a bowl, season with a little salt and pepper and blend with the blender adding the seed oil slowly to obtain the mayonnaise. Towards the end add the mustard.
Mix the mayonnaise with the vegetables and serve with croutons.