Preheat an oven to 425° F.

Using 1 teaspoon of the butter, grease an 8- or 9-inch gratin dish or other shallow baking dish, then sprinkle it with 1 tablespoon of the sugar. Arrange the fruit in the dish.

In a bowl combine the egg, milk, 1 tablespoon of the sugar, and the salt and whisk them together. When well mixed, gradually whisk in the flour. Pour this cream-like batter over the fruit. Sprinkle the remaining 3 tablespoons of the sugar, the butter, and the almonds over the top.

Bake until the batter is set, the butter melted, and the fruit cooked through, about 12 to 15 minutes.

Let stand about 10 minutes before cutting into wedges to serve.