By Danni Button,Veronika Bondarenko,Daniel Kline We tested the Pistachio Cream cold-brews and lattes to see if it’s January’s new flavor sensation. The fall and winter holidays are wildly busy times for the international coffee chain Starbucks (SBUX) – Get Free Report. It’s not uncommon for the month of August to see our social media feeds flooded with celebratory posts about the return of Starbucks’ infamous Pumpkin Spice Latte (PSL). The drink has become so famous it’s inspired comedy skits, songs and parodies, and various shirt and sweater options. The seasonal coffee bonanza only builds mo…