In a medium bowl, stir together strawberries, raspberries, sugar and lemon juice. Let stand until a fruit syrup forms, about 10 minutes.
Pre-heat the oven to 375 degrees Fahrenheit
In a large bowl, stir together the flour, milk, cornmeal, baking powder, cinnamon, and salt. Stir in the melted butter until well combined. Pour into an ungreased 8x8 square baking pan, smoothing top.
Spoon the fruit mixture over the batter quickly. Make sure to pour the fruit mixture over the batter quickly . If the batter cools too much, the fruit won't sink as well.
Bake until golden brown, 35 to 45 minutes. Cover loosely with foil halfway through baking if the top if getting too brown. Cover and refrigerate for up to 3 days.