This is an unusual snack, hearty and tasty. She likes even children.
Bring the ciabatta flesh to a crispy state in a frying pan. Peel the tomato, cut into cubes, season with salt and olive oil.
Punch pine nuts and ciabatta in a blender into very fine crumbs.
Mix the pine nuts, two thirds of the pesto and croutons, and roll the mozzarella in the resulting mixture.
Arrange tomatoes, remaining pesto, arugula and mozzarella on a plate. Decorate the dish with microherbs.