Soak bamboo skewers in water for minimum 30 minutes.
Combine soy sauce through hot pepper sauce in a small pot. Place over medium heat and bring to a boil. Stir regularly until mixture thickens slightly. Remove from heat and set aside. This is your sauce.
Cut your green onions into 1-1/2 inch pieces. Clean your mushrooms.
Thread mushrooms onto skewer, stem end first followed by a piece of green onion placed crosswise. Do not overcrowd mushrooms but continue until you have about 4 mushrooms per skewers.
Brush mushrooms/onions with sauce. Grill over medium heat, basting regularly with sauce until golden brown, approximately 5-6 minutes. Serve immediately.