In a large bowl place peaches, strawberries, diced tomatoes, blueberries, orange juice, sugar, cornstarch, and allspice. Toss to combine and dissolve cornstarch.
Spray baking pan with cooking spray. Add tomato mix.
In a seperate bowl, add gluten free flour.
Using two forks, cut shortening into flour until it looks like coarse sand.
Next, add milk and eggs into flour mixture. Stir until incorporated into a loose dough.
Dollop dough on top of tomato mix until mostly covered.
Sprinkle brown sugar and cinnamon on top of dough, then add butter, a teaspoon at a time around the dough.
Place in a preheated oven and bake for 40 minutes.