This leaf is part of the chicory family, and boasts curly leaves with a slightly bitter flavor. The inner lighter colored leaves go best as a part of a salad with a vinaigrette of choice, and the outer chewier leaves can be sauteed or grilled! Escarole is a nutrient-rich green, high in vitamin A, which has been shown to help reduce the risk of osteoporosis and cancer, vitamin K, which supports blood clotting, along with folate, vitamin C, dietary fiber, calcium, potassium, iron, and antioxidants like flavonoids and lutein.