Gazpacho Salad

1 large sweet onion, chopped
3 large cucumbers, peeled, seeded and chopped
2 bell peppers, seeded and chopped
4 tablespoons fresh cilantro, chopped
Dressing
3 tablespoons red wine vinegar
¼ cup extra virgin olive oil
3 garlic cloves, mashed
1 tablespoon salt
½ teaspoon freshly ground pepper
¼ teaspoon celery seed
Chop vegetables, macerate in dressing for 1 hour and serve on lettuce