Outrageous Herbacious Mediterranean Chickpea Salad

chickpeas (garbanzo beans), rinsed and drained, or 3 cups cooked chickpeas

medium red bell pepper, chopped

chopped fresh flat-leaf parsley (about 1 bunch)

chopped red onion

chopped celery plus leaves (about 2 ribs)

extra virgin olive oil

lemon juice (from 1 to 1½ lemons)

garlic cloves, pressed or minced

kosher salt and freshly ground black pepper