Moscow Mule
Season 2, Episode 6, “Bali Ha'i” (2016) · Kim Wexler and Rich Schweikart
Over a lunch where he courts Kim for his firm, Rich Schweikart drinks a Moscow Mule from a copper mug, and the drink comes to stand for the freer life Kim wants.
Sources: The A.V. Club - Better Call Saul 'Bali Ha'i' review; Flavorwire - Better Call Saul 'Bali Ha'i' recap