What you need

  • 100 g coffee, very coarse
  • 1 litre cold filtered water
  • A large jar and a paper or cloth filter

Steps

  1. Stir the coffee into the water until all grounds are wet.
  2. Cover and leave in the fridge for 14 to 18 hours.
  3. Filter twice: once through a sieve, once through paper.
  4. Serve one part concentrate to one part water or milk over ice.