Using a hand-held blender
, beat the cream cheese
until smooth. Add the sour cream, 1/4 cup sugar, powdered sugar, juice of two lemons, 1 tablespoon of the lemon zest, and vanilla. Beat until smooth. Fill each crepe with 3 tablespoons of the filling. Roll the crepes up tightly and place in the refrigerator. Refrigerate for 1 hour.
In a large saute pan, over medium heat, melt
the butter with the remaining 1/2 cup sugar, stirring constantly until the sugar dissolves. Add the remaining juice of six lemons and 1 tablespoon of lemon zest
. Stir to mix thoroughly. Add the crepes to the mixture. Remove the pan from the heat and add the cognac. Carefully place the pan, back over the heat and flame the mixture, shaking the pan back and fourth several times. Continue to shake until the flame dies out. Lay three crepes in the center of each plate. Spoon the sauce
over the top and serve.