Beat eggs until light add sugar and beat until thick
Add the vanilla
Sift flour with baking powder and salt and fold carefully into the egg mixture until well combined
Line a jelly roll pan with waxed paper
Butter it very well and sprinkle it generously with granulated sugar
Spread the batter evenly in the pan and bake in a moderate 350 oven for 20 minutes or until the cake is just set
Turn out onto a clean tea towel that has been well dusted with confectioners sugar and roll up while still hot Cool slightly then unroll and remove from the towel
When it has cooled spread the inside of the roll with the jam and whipped cream
Reroll
May use fresh strawberries and Cool Whip inside but make sure jelly roll is cool