Preheat your oven to 350°F (175°C).
In a bowl, cream together butter and sugar until smooth.
Add the egg, lemon zest, and lemon juice, mixing well.
Combine the flour, baking soda, and salt in another bowl.
Gradually add dry ingredients to the wet mixture.
Scoop dough into small balls and roll in sanding sugar.
Place on a baking sheet and flatten slightly.
Bake for 10-12 minutes, or until the edges are golden.
For the latte, brew green tea and let it cool.
Pour cooled tea over ice, add milk, and sweeten as desired.
Serve the cookies warm alongside the chilled latte.