In the bowl of your mixer, put flour, salt and finely chopped tarragon and mix on low for about 30 seconds
Add confectioner's sugar, ground pecans, softened butter and vanilla extract.
Mix until a dough is formed
Transfer dough on a sheet of plastic wrap and roll into a log.
Twist and fold ends of wrap and put dough in the fridge for at least half an hour so it's easier to cut it into slices.
Preheat oven to 375°F
Unwrap dough and slice into ¼-inch thick slices.
Place on a parchment-lined baking sheet.
Bake for about 12-15 minutes or until edges are brown.
Let cool for about 5 minutes then transfer to a wire rack to cool to room temperature.
Enjoy with your favorite cup of tea or coffee.