How do you turn all purpose flour into bread flour?

To turn all-purpose flour into bread flour, you can add vital wheat gluten. Vital wheat gluten is a protein that is naturally found in wheat flour. It is the protein that gives bread flour its elasticity and strength, which is necessary for making bread. To add vital wheat gluten to all-purpose flour, simply mix in 1 tablespoon of vital wheat gluten per cup of all-purpose flour. You can then use the enriched all-purpose flour in any bread recipe that calls for bread flour.