Whisk the matcha, salt and 80ml of water together vigorously – make sure there are no lumps! Whisk in the soy milk and sugar syrup, and chill well before serving. Serve over some ice.
Note: It could well be the basis of a boozy cocktail – try adding vanilla vodka and/or chocolate liqueur (you can work out the magical quantities).
Junk Food Japan: © Scott Hallsworth, 2017. Photography © David Loftus, 2017