How to Make It
Using a vegetable peeler, remove 6 (2-inch) lemon peel strips from lemon. Squeeze lemon to equal 2 tablespoons juice. Set aside strips and juice.
Heat oil in a large Dutch oven over medium-high. Add shallots and rosemary. Cook, stirring occasionally, until translucent, 4 to 5 minutes. Add lemon peel strips, stock, and potatoes. Bring to a boil over high; reduce heat to medium. Add chicken and salt, and cook 10 minutes. Add orzo, and cook until a thermometer inserted in thickest part of chicken registers 165°F and potatoes and orzo are tender, about 10 minutes more.
Remove and discard lemon peel strips. Remove and shred chicken; return to soup. Stir in lemon juice. Ladle soup into bowls; sprinkle evenly with chopped parsley.