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NOTE: Prepare filling a few hours before making the cake so that it has time to set up and chill.
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FILLING: In a small saucepan, combine sugar and cornstarch.
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Stir in 23 cup water.
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Cook over medium-low heat, stirring constantly, until mixture becomes translucent, thickens and bubbles, 6 to 8 minutes.
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Cook 1 minute longer.
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Remove from heat.
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In a small bowl, beat 1/2 of hot mixture into egg yolk, then stir back into saucepan.
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Cook, stirring, 1 minute longer.
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Stir in lemon juice and lemon zest.
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Pour into a small bowl.
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Press plastic wrap directly on surface.
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Refrigerate at least 3 hours, or until very cold.
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CAKE: Preheat oven to 375F (190C).
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Coat a 10x15 inch jelly roll pan with cooking spray.
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Line bottom of pan with wax paper, trim off excess paper from edges and coat again with cooking spray.
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On a sheet of wax paper, combine flour, baking powder and salt.
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In small bowl of electric mixer, beat egg whites with cream of tartar on high speed til firm peaks form; set aside.
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In large bowl of electric mixer, beat egg substitute until thick and creamy, about 1 minute; lower speed.
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Gradually add sugar, beating constantly, until mixture is very thick, about 2 minutes.
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Stir in 13 cup water and vanilla.
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Add flour mixture, stirring until combined.
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Fold in beaten egg whites.
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Spread batter evenly in prepared pan.
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Bake 12 to 13 minutes, or until cake just begins to pull away from the sides of the pan and springs back when lightly pressed with a small metal spatula.
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Loosen cake around edges with a knife.
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Invert pan onto a clean kitchen towel dusted with 2 tb.
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powdered sugar; peel off wax paper.
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Gently roll up cake and towel together from short end.
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Place roll, seam side down, on a wire rack; let cool completely.
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When cool, unroll cake carefully.
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Spread with Light Lemon Filling.
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To start rerolling, lift end of cake with towel.
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Place roll, seam side down on serving platter.
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Dust with remaining 1 tb.
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powdered sugar.