Add the sliced onions and olives on top of the fennel and oranges.
Drizzle white balsamic vinegar over the entire salad.
Notes
How To Cut And Slice Fennel
Remove the Fronds: Cut off the feathery fronds at the top of the fennel bulb. Save these for garnish or another recipe if you like. Next, cut off the root end of the fennel bulb and discard it.
Remove Outer Layers: Peel off the tough outer layers of the fennel bulb.
Cut Down the Center: Stand the fennel bulb upright and cut it in half from top to bottom. - At this point, decide if you want to remove the core. The core is edible but a bit firmer than the rest of the bulb. Leaving it in keeps the slices together, while removing it gives you thin individual strips. I chose to leave the core in.
Cut Thin Slices: Lay each half flat and thinly slice one half for the salad.
Consider using the remaining half of the fennel bulb for other salads or in soups or pasta dishes.How To Cut The Orange
Remove the Ends: Cut off both ends of the orange and discard them.
Remove the Peel: Carefully slice downward to remove the peel, following the natural curve of the fruit. Continue until all the peel is removed.
Ready to Slice: Now your orange is ready to be sliced into rounds.