Mantou Buns with Soya Milk

• 7 oz soybeans
• warm water, to soak

Mantou Buns

• 1 ½ tsp active dry yeast
• 1 ½ oz brown sugar
• 8 ½ oz water
• 18 oz all-purpose flour, plus extra to dust
• 2 tsp vegetable oil, plus extra to grease
• 1 tsp salt

Soya Milk

• 41 oz cold water
• 2 - 3 oz sugar, to taste