Heat a Dutch oven coated with cooking spray over medium-high heat. Add tempeh; saute 8 minutes or until golden brown. Add wine and soy sauce; cook 15 seconds or until liquid almost evaporates. Remove tempeh from pan.
Add leek and mushrooms to pan; saute 5 minutes. Stir in flour; cook 1 minute, stirring frequently. Tie the celery leaves, thyme sprigs, and parsley sprig together securely with string. Add herbs, garlic, and broth to pan; bring to a boil. Add tempeh, stirring well. Cover, reduce heat, and simmer 15 minutes.
Uncover and cook 3 minutes or until thick. Discard herbs. Stir in lemon juice, salt, and pepper; sprinkle with parsley. Garnish each serving with 1/2 teaspoon lemon rind, if desired.