Drain and rinse 850g of canned white beans. Put them in a large bowl with 1 medium thinly sliced red onion, 4 medium diced tomatoes, ¼ cup of chopped parsley, and 1 tablespoon of sumac.
Whisk ¼ cup of olive oil, the juice of 1 medium lemon, 2 tablespoons of apple cider vinegar, and ½ teaspoon of salt. Pour over the salad and toss gently.
