Line two baking sheets with parchment paper.

Finely grind ½ of the nuts in a food processor to the texture of cornmeal and transfer to a medium bowl.

Coarsely chop remaining nuts in the food processor and add to the same bowl and stir in flour and salt.

In a large bowl beat butter and superfine sugar with a hand mixer until light and fluffy. Add vanilla.

On low speed, slowly mix in the nut flour mixture until combined. Scrape bowl and beaters and continue until dough is cohesive.

Working with 1 tablespoon of dough at a time, roll dough into balls and lay on prepared baking sheets.

Bake until pale gold and bottoms are just beginning to brown. About 20 minutes.