If there is a perfect tool for every job, what is the perfect tool for delighting one’s guests?

This, of course, is a trick question, because one can almost certainly delight one’s guests with practically any formulation of The St‑Germain Spritz. However, if one employs the use of this one-liter custom glass carafe with fill marks for Champagne, St‑Germain and Sparkling Water, one can be assured of handcrafting no fewer than five perfect St-Germain Spritz for them at a time. This has been known to produce feelings of awe and admiration toward the host in question.

1L carafe yields about 5 perfect cocktails per batch.