Whipped cream, mint sprigs and thinly sliced lemon (optional)
Combine Ricotta cheese, lemonade concentrate, eggs, sugar and flour in food processor or bowl. Process or beat with electric mixer 2 minutes, scraping down sides of work bowl once.
Pour mixture into pie crust. Bake in preheated 350°F oven 50 minutes or until center is set. Transfer to cooling rack; cool completely. Cover and chill 4 hours or longer. Garnish with whipped cream, mint sprigs and thinly sliced lemon, if desired.