recipe of sourdough bread - how to make a sourdough bread/how to bake and cook sourdough bread

Ingredients

1 1/2 cups water, warm
1 tablespoon yeast
1 cup sourdough starter
3 cups bread flour
2 teaspoons sugar
2 teaspoons salt
1 teaspoon baking soda
2 cups bread flour

Directions:

1 In a large mixing bowl dissolve yeast in warm water, mix with starter.
2 Add 3 cups flour, sugar and salt, stir vigorously 2 or 3 minutes.
3 Cover with a cloth, set in warm place and let rise 1-1/2 to 2 hours or until doubled in size.
4 Mix baking soda with 1 cup of remaining flour and stir in, the dough should be stiff.
5 Turn out onto a floured surface and begin kneading.
6 Add the remaining 1 cup of flour or more if needed to control stickiness.
7 Knead until satiny, between 5 and 10 minutes.
8 Shape into 2 oblong loaves or 1 large round loaf, place on lightly greased cookie sheet.
9 Cover with a cloth, set in warm place free from drafts and let rise 1 to 2 hours or until nearly doubled in size.
10 Before baking, brush outside with water and make diagonal slashes across the top with a sharp single-edge razor blade.
11 Put a shallow pan of hot water in the bottom of the oven.
12 Bake at 400° F for 45 minutes or until the crust is a medium dark brown.