Begin by peeling the onion and slicing it into ultra-thin rounds. For best results, use a mandoline slicer to achieve uniform slices. If cutting by hand, aim for the thinnest slices possible. Gently separate the rings to distribute them evenly throughout the salad.
In a large salad bowl, pour the dressing at the bottom, but do not mix yet. Add the baby spring greens and the sliced onions into the bowl, ensuring they remain undisturbed to preserve their delicate structure.
Garnish the salad with an artistic scattering of edible flowers, allowing their vibrant colors to contrast beautifully against the greens. Bring the salad to the table and toss with the dressing just before serving to keep the ingredients crisp and fresh. Alternatively, serve the dressing on the side, allowing guests to drizzle it according to their preference.