Butter the baking dish or spray it with vegetable oil. Preheat your oven to 375°F (190°C).
Combine the fruit, half the sugar, and the lemon zest in a bowl. Set aside.
In a bowl, whisk together the flour, remaining sugar, and salt. Set aside.
In a separate bowl, whisk the eggs for about one minute, until thickened and foamy. Add the dry ingredients and whisk until there are no more lumps. Drizzle in the milk and mix until well combined.
Spread the fruit evenly over the bottom of the dish. Slowly pour the batter overtop.
Bake for 35 to 40 minutes, until lightly browned around the edges and well set in the middle. Cool completely.
Once cool, keep refrigerated until serving. Dust lightly with icing sugar to serve.
