Hibachi Style Chicken with Magic Mustard Sauce

Name: Hibachi Style Chicken with Magic Mustard Sauce
Cuisine: Asian
Ingredients: 2 tsp. ground mustard powder; 2 tbsp. warm water; 3 tbsp. tahini; 1/2 cup coconut aminos; 1 tsp. Red Boat Fish Sauce; 1/2 inch chunk of ginger (peeled); 2 cloves garlic; 2 lbs. boneless (skineless chicken thighs (trimmed, and cut into 1 inch chunks)); 1/2 white onion (thinly sliced); 8 baby bella mushrooms (stems removed and cut into fourths); 2 small zucchinis (cut into thin, short strips); 2 small carrots (cut into thin, short strips); 2 tbsp. avocado oil; 1 tbsp. ghee (sub butter if not Whole30); kosher salt (to taste); black pepper (to taste); 1 tbsp. toasted sesame seeds