Norwegian Apple Soup {Food of the World}

Name: Norwegian Apple Soup {Food of the World}
Cuisine: European
Ingredients: 2/3 cup sugar; 1 teaspoon ground cinnamon; 4 cups water; 1 1/2 tablespoons cornstarch or tapioca flour; 5 small apples, peeled, sliced, and cored (just over a pound); juice of a lemon; pinch of salt; a good grind of pepper; 1 scoop plain yogurt or ice cream per serving; Chopped walnuts or pecans for garnish