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Heat oven to 200C/fan 180C/gas 6. Line a 27 x 40cm Swiss roll tin with non-stick baking parchment. Using electric beaters, whisk the eggs and sugar together until light and fluffy – this can take about 5 mins. Fold in the flour, caraway seeds (if using) and zest, then gradually fold in the butter. Tip the mix into the tin and bake for 12-15 mins until pale, but cooked and springy in the middle. Leave to cool a little, then turn out onto a sheet of non-stick baking parchment dusted with sugar, roll up like a Swiss roll and cool.
While the sponge is cooling, mix the lemon juice and half the lemon curd with the mascarpone and set aside. When the sponge is completely cool, unravel and spread with the mascarpone mix. Spread the remaining curd over the top, then roll up like a Swiss roll again. Dust heavily with icing sugar and serve in slices.