For the cookies: Preheat oven to 350 degrees. Beat butter with sugar and vanilla in a medium bowl until well blended. Stir in flour, salt, tea and spices until just combined. Scoop and roll dough into small teaspoon-sized balls and place about an inch apart on a parchment-lined baking sheet. Press down lightly to flatten. Bake until lightly golden, about 15 min. Cool on the baking sheet for 5 min. and then transfer to cooling rack.
For the glaze: Stir powdered sugar, water and extract together in a small bowl. Spread glaze on top of completely cooled cookies, then sprinkle with tea leaves for garnish. Let glaze set for 5 to 10 min. before serving cookies.