Preheat the grill to high. Lay the slices of bread slightly overlapping in a shallow flame proof dish.
Sprinkle 2 tablespoons of the sugar in an even layer over the bread and grill for about two minutes until the bread is toasted and the sugar is just starting to carmelise.
In a bowl mix the cornflour into the fromage frais.
Pile the fruit down the middle of the bread and sprinkle with 1 tablespoon of the sugar.
Drop spoonfuls of the fromage frais mixture on top, then sprinkle the rest of the sugar over.
Put the dish as close to the heat as you can and grill for about 6-8 minutes, until the fromage frais has browned and everything else is starting to bubble and turn juicy.
Leave it to sit for a minute then serve hot.