Nikolaschka and White Russian are not made of beer.
A Nikolaschka is typically an after-dinner drink. 
Pour cognac brandy snifter and place the lemon disk on top of the glass. 
A White Russian is a cocktail made with vodka, coffee liqueur (e.g., Kahla or Tia Maria), and cream served with ice in an Old Fashioned glass. 
 Often milk will be used as an alternative to cream. 
