Use oil-based food coloring only.
Water-based food coloring can cause melted chocolate to seize. For the smoothest basketball-orange color, use an oil-based candy coloring designed for chocolate.
Cold mascarpone is your friend.
Add the mascarpone straight from the refrigerator and mix gently. Overmixing can cause the filling to become loose or grainy.
Don't oversoak the cake.
The orange bourbon syrup adds moisture and flavor, but a light brushing is all you need. Too much syrup can make the cake balls difficult to shape.
Double-coat the shells.
A second layer of chocolate creates sturdier shells that unmold more easily and hold the filling without cracking.
Pipe the basketball lines first.
Creating the design directly in the mold before adding the orange chocolate produces a cleaner, more professional finish than piping the lines afterward.
For the cleanest release.
Allow the shells to chill completely before unmolding. If the chocolate is properly set, the mold should release with minimal pressure.
Make ahead friendly.
The cake can be baked up to 2 days in advance and stored tightly wrapped at room temperature before assembling the truffles.