1 oz of Vodka
1 squeeze of lemons
3-5 oz of chilled root beer (or Ginger beer)
2 oz of chilled jagermeister herbal liqueur (or Jagermeister)
Add ice to a collins glass. Pour Jagermeister and vodka over the ice (Jagermeister should be chilled, of course). Add root beer to fill glass/to taste, and then finish it off with a squeeze of a lemon-quarter, and serve.