Cinnamon sugar palmiers

Name: Cinnamon sugar palmiers
Yield: Makes 18 palmiers
Cuisine: French
Ingredients: 250 g (9 oz) all-butter puff or rough puff pastry; Pinch of fine sea salt; 100 g (3½ oz) caster sugar; 6 green cardamom pods, seeds ground; ¾ teaspoon ground cinnamon