Combine the 3 cups cooked grains, 1 cup cooked lentils, 1 cup cooked green beans, 1 can drained garbanzo beans, 1 head chopped fennel, 3 chopped Persian cucumbers and 4 chopped scallions in a large bowl.
In a separate medium bowl combine 6 finely chopped cherry peppers, 4 cloves minced garlic, 4 teaspoons sugar, 2 teaspoons salt, 1/2 teaspoon pepper, and 1/3 cup apple cider vinegar. Slowly drizzle in the 1/2 cup olive oil, whisking continuously until all oil has been added. Pour dressing over grain mixture and stir well to combine.
Chill in refrigerator at least one hour before serving to let flavors meld. Taste and add more salt and pepper, sugar or vinegar as needed. Serve cold or room temperature.