Start by combining sugar with the orange zest in a small bowl, letting the oils release for extra flavor. Mix in the flour, then toss the berries in this mixture. This will thicken the fruit juices while keeping the berries bright and juicy.
Mix the flour, salt, baking soda, and baking powder. Cut in cold butter with your fingertips until pea-sized pieces remain. Whisk together buttermilk and honey, fold into the dry mixture, and form a soft, layered dough.
Arrange the biscuit pieces over the berry filling, spacing slightly apart. Freeze briefly while preheating the oven. Brush with buttermilk, sprinkle turbinado sugar, and bake until the biscuits are golden and the filling bubbles.