Put 4 to 6 litres of water into a pan and bring to the boil.
Open the foil bag marked number 1, take out the muslin bag
which contains the hops and grains and place into the pan.
Stir gently so all the ingredients in the bag are soaked. Replace the
lid and boil for 30 minutes. Check the level of water in the pan
every 10 minutes or so and top up with water from a boiling kettle.
This is important for maximum flavour.
If your kit only contains one foil bag the boiling time is 40 minutes.