Step 1

Day 1: Mix 1/2 cup (60 g) whole wheat flour, 1/2 cup (60 g) all-purpose flour and 1/2 cup (120 g) water in a clean jar. Cover the jar loosely and leave it in a warm area, 70°F (21°C), for 24 hours.

Step 2

Day 2: Stir the starter, cover the jar loosely and let it rest for 24 hours.

Step 3

Days 3-7:  Add 2 tablespoons (30 g) of starter from the day before to a clean jar along with 1/2 cup (60 g) all-purpose flour and 1/4 cup (60 g) water. Stir until smooth, cover loosely and let rest at room temperature for 24 hours.

Step 4

Repeat daily feedings until the starter is ready to bake with. You'll know it's ready when it doubles in size within 4-12 hours after feeding it, the texture looks light and fluffy with plenty of bubbles on the surface and around the sides of the jar. Colder kitchens will take longer than warmer kitchens.