This recipe details a method for creating a sourdough starter from scratch using all-purpose flour and warm water, involving an initial mix and subsequent daily feedings in a warm environment.
To make the starter, mix together 1/2 cup of all purpose flour and a little less than 1/4 cup of warm water until it forms a thick paste. Turn your oven to 150°F (65°C), let it heat up for about 5 minutes until warm inside. Cover the jar containing the mixture and place it in the warm oven. For 2 days, periodically (2-3 times each day) turn the oven to 150°F to maintain a warm environment for the starter. After these 2 days, when the starter starts to bubble slightly and has a thin consistency with a slightly fermented smell, begin the feedings. Stir in 1/2 cup of all purpose flour and a little less than 1/4 cup of warm water. Keep it warm. Repeat these feedings every 24 hours for five days until the starter is ready. The author notes that they used a sealed jar and metal stirring utensil, which are generally not recommended but still worked in their experience.
