From the Saltie cookbook - this is an amazing lunch place in Williamsburg, Brooklyn, that does delightful salads and sandwiches, and, as it turns out, also amazing sweets.

1.25 tsp dried lavender flowers (or 2.5 tsp fresh)
225 g butter 
3/4 C granulated sugar
1 egg yolk
1 tsp vanilla extract
2 C flour
1/2 tsp salt
large granulated sugar, to sprinkle

Grind up the lavender flowers (mortar/pestle; spice grinder)
Cream butter and sugar until fluffy, add egg yolk and vanilla and beat until smooth.
Whisk fl...

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