Cut cucumber into slices. Cut tomato in wedges. Slice the onion super thing. Place these 3 ingredients and chopped dill in a mixing bowl.
Place all other ingredients except oil in a blender. Turn on low, then bump up to high speed.
With blender running, drizzle in the oil until a well emulsified dressing is achieved. Adjust seasoning if needed.
Toss some of the dressing on the cucumbers, tomatoes, onion, and dill. Serve on a bed of greens. You can serve extra dressing on the side or save for a future salad.
Keyword cucumber, Dill, Fresh, Onion, refreshing, salad, spring