Whisk lemon juice, sugar, egg, egg yolks together. Whisk in the cream until the sugar dissolves. Pass the mixture through a strainer; stir in the lemon rind.
Place 6 - 3/4 cup pot de creme cups, or custard cups, in a large roasting pan. Divide the mixture evenly into the cups. Pour enough hot water in the pan to come halfway up the sides of the dishes. Cover the pan with aluminum foil. Place in oven and bake until the custard is just set around the edges, approximately 35 minutes.
Remove the pan from the oven. Remove dishes from the pan and allow them to cool. Then, cover and chill in refrigerator at least 2 hours and as long as overnight.
Beat the remaining whipping creme until soft peaks form. Spoon one tablespoon of whipped cream atop each pot de creme. Place one "peep" in the cream to hold it upright.