a half ounce Raspberry Vodka 
  a half  ounce Peach Schnapps
     1 ounce of fresh lemon or sweet and sour mix
     1 ounce of 7-up or Sprite Soda

Then you have to shake the vodka, Schnapps and fresh lemon or sweet and sour mix in a cocktail shaker with ice. Pour into a martini glass and add 1 ounce of 7-up or Sprite and its done, ready to serve.