Shake all but the ginger beer and thyme. Double strain into a Collins glass filled with ice cubes. Add the ginger beer. Gentley swizzle. Garnish with a thyme sprig and several finger lime "caviar" pulp.
For the syrup: bring to a slow simmer 100g guava puree (Ponthier), 100g honey, 100g water & 1 vanilla bean (5 cm bean = 1 tsp extract).