and place into a salad bowl. Add the remaining ingredients and toss lightly. NOTE: Lightly toasted sesame seeds may be substituted for the walnuts. To make moretum more authentically, use only two lettuce leaves; place them and the remaining green ingredients into a blender and blend well. Transfer to a mixing bowl, and add the cheese and ground pepper. Form into a ball. Add the vinegar and oil in sparing amounts.