The second best-selling cocktail at Standby in Detroit is The Snake in the Grass. And it's made with mustard. Spicy, vegetal mustard greens, to be exact, that have been nitro-muddled in the fashion of Dave Arnold's Thai Basil Daquiri. Standby's Rising Star Bartender Joe Robinson first tasted the greens at nearby Ghost Acre Farms. "They made my eyes water.