Combine the Field Fire, lime juice, grapefruit juice, pomegranate juice, and jalapeno slices into a large pitcher. The longer the jalapenos sit, the spicier the drink. Strain out the jalapenos and discard. Return the drink to the pitcher and chill until ready to serve. When ready, fill the pitcher with ice and top off with ginger beer. Or fill glasses with the mix and top off each glass with ginger beer.