Preheat oven to 425°F.
Grease bottom of shallow 8 or 9-inch gratin dish. Dust lightly with 1 tablespoon of sugar.
In a bowl, whisk together eggs, milk, salt and 1 tablespoon of sugar. Gradually whisk in flour. Pour batter into dish. Arrange fruit as desired on top of batter. Sprinkle nuts over fruit and batter. Sprinkle sugar over top of the nuts and fruit and dot remaining 1 tablespoon of butter.
Cook 12-15 minutes or until batter is set and larger fruit is cooled through. Remove from oven and let cool 10 minutes. Lovely with a little espresso!