Delicious French Dip Sandwich

Ingredients

• 2 tbsp oil
• 1 1/2 tbsp arrowroot powder, cornstarch works too
• 32 oz box beef broth, divided
• 1/2 tsp black pepper
• 1 onion, thinly sliced
• 1/2 tsp salt
• 1 bell pepper, long thin slices
• dairy free cheese slices, Follow Your Heart Gouda cheese works
• 1 lb deli roast beef or ham, sliced thin
• gluten free rolls, bread, baguettes
• 1 clove garlic, minced
• 2 tbsp gluten free Worcestershire sauce