Begin with making the brine. Pour 1 litre (4 cups) water into a stockpot. Add the lemon, thyme, salt, brown sugar, caster sugar and peppercorns. Bring to a boil over high heat, stirring frequently, until the sugars dissolve. Remove from the heat. Stir in 2 litres (8 cups) water. Place in the fridge until the brine is cooler than 4°C on a cook’s thermometer. Add the chick