1. Preheat the turbo broiler at 325°F / 160°C.
2. In a large bowl, beat eggs until fluffy, gradually stir in sugar until smooth and thick.
3. Sift flour, baking powder and salt then fold into the egg mixture.
4. Pour into a baking tray lined with wax paper.
5. Bake with the same settings for 15 to 20 minutes or until springs back when gently pressed.
6. Let it cool for 10 minutes.
7. Spread the strawberry jam on the top of the sponge cake then roll tightly.
8. Dust the roll with sugar. Cut into thin slices to serve.