Cut the onion, tomatoes, red pepper, cucumber, and scallion into small chunks and place in a food processor with the garlic clove. Using intermittent pulses, chop vegetables, being careful not to over process. The mixture should have some pieces of vegetable that are recognizable.
Remove the mixture to a large bowl and add the remaining ingredients. Refrigerate for at least several hours and taste again for seasonings just before serving.
Yield: About 7 1/2 cups
Frances Stolper is well-known for her cooking and entertaining. She is the Food Editor’s mother-in-law.