Method

1. Combine the walnuts, cardamom, 3/4 cup of the icing sugar, the flour and sea salt in the bowl of your food processor and pulse until mixture just starts to come together into a dough.
2. Turn out onto your work surface and lightly knead into a ball.
3. Cut this into three, form into rough discs, cover and place in the fridge to chill for an hour.
4. Line a couple of oven trays with baking paper.
5. Take one of the discs of dough out of the fridge, cut away a small amount, about the size of an unshelled walnut and roll into a small sausage shape, then bring the ends together into a crescent shape.
6. Place on one of your prepared trays and repeat with remaining dough then remaining logs of dough.
7. Freeze the shaped biscuits for 20 minutes.
8. Preheat oven to 180C.
9. Cook biscuits (straight from freezer) for 15-20 minutes or until beginning to turn golden brown.
10. Leave to cool on the trays for a couple of minutes, then gently transfer to a wire rack to cool completely.
11. Mix the remaining icing sugar with a little ground cardamom (about 1/4 tsp), dust the biscuits with this mixture and serve.