• 1/3 cup red wine vinegar
• 1/4 tsp black pepper ((optional))
• 1 (15 oz.) can cannellini beans, drained and rinsed
• 1 (15 oz.) can kidney beans, drained and rinsed
• 1 (15 oz.) can chickpeas, drained and rinsed
• 4 stalks celery, diced ((4 stalks yield ~1 cup or 120 g))
• 1/2 medium red onion, diced ((1/2 medium onion yields ~3/4 cup or 72g))
• 1/2 cup chopped fresh parsley ((optional))