Line a baking tray with silicon paper and set aside
In a large bowl combine: eggs, oil, sugar, vanilla essence, and lemon rind and whisk with a fork to combine for 30-40 sec
Add flour into the egg mixture and gently mix in until just combined
Add the roasted hazelnuts and mix in, do not overmix
Divide and shape mixture into 2 equal logs
Place logs onto a tray lined with silicon paper, coat top of biscuits with little
extra caster sugar
Bake at 160c fan forced oven for 22 minutes or until logs are lightly coloured
Remove tray from the oven and set aside for 10-15 minutes, to allow them to cool but not completely cold
Gently place logs onto a chopping board, and using a serrated knife, slice logs
diagonally into 2 to 2.5 cm slice
Place sliced biscuits back onto the baking tray and re-bake to dry at 160c fan forced for 5-6 minutes or less - check.