Combine Vinegar, sugar, salt and pepper.
Wash and thinly slice cucumbers and Onions, add to vinegar mixture, toss to coat.Let marinate for 1-2 hours.Medium dice red and yellow tomatoes and place in bowl.Add small amount of vinegar marinate to tomatoes, add olive oil, salt, pepper and chopped basil.
On plate: fan cucumber slices in circular shape.Place marinated tomatoes in center of circular shape. Drizzle with vinegar mixture
Nancy and Tim Bass - Sunburst Tomato