Add all the ingredients except the ginger beer to a shaker with ice and shake.
Strain over crushed ice in a copper mug, then top with the ginger beer.
Top with more crushed ice.
Garnish with fresh raspberries.
*Raspberry cordial: In a saucepan, bring 10 oz water and .3 lb raspberries to a boil, and simmer for 10 minutes. Add .7 lb fine sugar, and stir until dissolved. Fine-strain the cordial into bottles.