In a heavy-based saucepan, bring the milk to a gentle simmer. It should be foamy and steamy and read 85°C (185°F) on a thermometer.
Slowly pour in the lemon juice and stir until the milk separates and curds begin to form. This should take 5–7 minutes. Leave the heat on low.
Lay a piece of cheesecloth (muslin) in a colander with a bowl underneath and pour the mixture on top. Set