Sourdough

• 1.5 kg baker’s flour
• 1.2 litres water
• 30 g

In a mixing bowl, mix together 300 ml water and 500 g flour, 10 g salt and the onion. Leave the mixture to stand in a warm place for 24 hours.

The following day, remove the onion and add 500 g flour, 300 ml water and 10 g salt. Cover with a damp cloth and leave in a warm place for a further 24 hours. The next day repeat the process.