Whisk the egg with milk in a soup plate, and spread the sugar on a flat plate. Using a rolling pin, flatten the bread slice so that it is easier to roll up.
Spread ¾ tablespoon Nutella on each bread slice, then add the Hortifrut strawberries on the lower part of the bread square (if the strawberries are too big, it is better to cut them to make rolling easier). Roll up each bread.
Melt the butter in a pan, roll each roll through the egg batter, shake off the excess, and put it in the pan for 4 minutes, until golden on all sides. Repeat with all the rolls.
Take the rolls out of the pan and place them immediately on the plate with sugar, smearing them on all sides. Eat them hot with a tasty cup of coffee.