Mediterranean Three Bean Salad

INGREDIENTS

• 1 (15 ounce) can cannellini (white kidney) beans, rinsed and drained
• 1 (15 ounce) can garbanzo beans, rinsed and drained
• 1 (15 ounce) can dark red kidney beans, rinsed and drained
• 1/2 onion, minced
• 2 cloves garlic, minced
• 2 tablespoons minced fresh parsley, or to taste
• 1/4 cup olive oil
• 1 lemon, juiced
• salt and ground black pepper to taste