More sorrel can be an elusive ingredient to find, as not all grocery stores carry this tangy herb. However, there are a few synonyms that can be used in place of sorrel in recipes. One option is spinach or kale, which have a similarly earthy taste and can add a refreshing burst of green in salads or as a side. Another option is arugula, also known as rocket, which has a slightly spicy and peppery flavor. Other herbs such as parsley, cilantro, or even dill can also be used in place of sorrel to add a fresh, herbaceous note to dishes.