Vegan French Dip Sandwiches - made with meaty, tender seitan

Ingredients

• 3 cups vital wheat gluten
• 2 Tbsp chickpea flour
• 1/4 cup nutritional yeast
• 1 Tbsp ground cumin
• 1.5 cups cold water
• 1/2 cup soy sauce
• 1 Tbsp ketchup
• 1 Tbsp olive oil
• 2 large cloves garlic
• 1 tsp rice wine vinegar
• 2 cups water
• 2 Tbsp soy sauce
• 1 tsp garlic powder
• 1 tsp onion powder
• pinch of black pepper (or two)
• vegan sliced provolone (Daiya and Follow Your Heart both make these. or cheese sauce (optional))
• small rolls