Mix cake flour, almond flour, and Earl Grey tea bag in a bowl.
Add sugar and salt to room temperature butter and cream until smooth.
Add egg, lemon zest, and lemon juice and mix well.
Sift the dry ingredients and add to the dough, mixing thoroughly.
Cover with plastic wrap and rest in the refrigerator for 30 minutes.
Shape the dough into rounds, flatten, and place on a baking tray.
Bake in a 180°C oven for 13 minutes.
Place on a cooling rack and let cool completely.