Beat eggs on high speed for about five minutes.Gradually beat in 1 cup sugar.Stir in 2/3 cup pumpkin and the lemon juice.Mix dry ingredients together in separate bowl. Fold into the pumpkin mix. Line a 15" x 10" x 1" baking sheet with parchment paper. Spray the parchment with nonstick cooking spray. Spread the batter onto a baking sheet and smooth out.Top with chopped pecans and bake at 375 degrees F. for 15 minutes.
Turn out onto lightweight towel and while the cake is hot and dust generously with powdered sugar. Roll towel and cake together. Cool completely.
Beat all ingredients together until smooth. Unroll the cake. Spread filling evenly, roll back up without the towel, and place on serving platter, cover and chill. When ready to serve, dust generously with powdered sugar to give it a festive and snowy look.