Add garlic powder and ginger to flour and stir. Mix liquids together and add to flour mixture all at once. Mix vigorously with a fork. When it forms a stiff dough, knead it 10 to 15 times.
Let the dough rest 2 to 5 minutes, then knead it a few more times. Let it rest another 15 minutes before proceeding.
Cut gluten into 6 to 8 pieces and stretch into thin cutlets. Simmer in broth for 30 to 60 minutes.
Combine all ingredients in a large saucepan. Bring broth to a boil. Add cutlets one at a time. Reduce heat to barely simmer when saucepan is covered. Seitan may be used, refrigerated, or frozen at this point.