If you're looking to substitute whole wheat flour for rustic bread, there are a few alternatives you can consider. Here are a few options:
All-Purpose Flour: All-purpose flour is a common substitute for whole wheat flour in rustic bread recipes. It will give your bread a lighter texture and milder flavor compared to using whole wheat flour. When using all-purpose flour, you might need to adjust the amount of liquid in the recipe slightly, as all-purpose flour absorbs less liquid than whole wheat flour. Start by using the same amount of all-purpose flour as the whole wheat flour called for in the recipe, and gradually add more if needed until you achieve the desired consistency.
Bread Flour: Bread flour is another suitable substitute for whole wheat flour in rustic bread recipes. Bread flour has a higher protein content than all-purpose flour, which helps create a chewy and sturdy texture in bread. You can use bread flour as a 1:1 replacement for whole wheat flour, but keep in mind that the texture and flavor of the bread may be slightly different.
Spelt Flour: Spelt flour is an ancient grain flour that has a nutty flavor and a texture similar to whole wheat flour. It can be used as a substitute for whole wheat flour in rustic bread recipes. Substitute spelt flour on a 1:1 basis for whole wheat flour, but note that the resulting bread may have a slightly lighter texture.
Rye Flour: Rye flour can be used as a partial substitute for whole wheat flour in rustic bread recipes. Rye flour adds a distinct flavor and can enhance the overall texture of the bread. For a rustic bread, you can replace up to 25-50% of the whole wheat flour with rye flour, depending on your preference.
When substituting flours in bread recipes, it's important to remember that different flours have varying absorption rates. You may need to adjust the liquid content or add additional flour as needed to achieve the right dough consistency.
Experimenting with different flour combinations can result in unique flavors and textures, so feel free to explore and find the blend that suits your taste preferences.