Start by cutting the tomatoes into quarters and place them in a mixing bowl. Set aside.
Next, cut the pepper into four parts; discard the stem and seeds. Place the cut bell pepper in a food processor with the garlic and process until they form a paste. Transfer to a bowl and then add paprika, sumac, salt, pepper and olive oil. Mix well.
Pour the dressing over the cut tomatoes and mix to cover on all sides. Mix in the chopped parsley and let chill for 30 minutes for the flavors to blend well.
Transfer to salad serving bowl and serve.