Pumpkin Cake Roll
["3 eggs", "1 c. sugar", "2/3 c. pumpkin", "1 tsp. lemon juice or 1/2 tsp. vinegar", "3/4 c. flour", "1 tsp. baking powder", "2 tsp. cinnamon", "1/2 tsp. salt", "1/2 c. finely chopped nuts (optional)"]
["Beat eggs at high speed for 5 minutes.", "Gradually add sugar. Stir in flour, baking powder, cinnamon and salt.", "Stir in pumpkin and lemon juice.", "Spoon into greased and floured 15 x 10 x 1-inch pan.", "Top with nuts.", "Bake at 375\u00b0 for 15 minutes.", "Turn out on towel; sprinkle with powdered sugar.", "Starting at narrow end, roll towel and cake together.", "Cool.", "Unroll for filling."]
["eggs", "sugar", "pumpkin", "lemon juice", "flour", "baking powder", "cinnamon", "salt", "nuts"]