Saucy Korean Beef Stir Fry

INGREDIENTS

1 lb

beef top sirloin or flank steak (sliced as thinly as possible)

small onion sliced into very thin strips

2 tbsp

cornstarch, divided

garlic cloves, minced

1 tbsp

freshly grated ginger

3/4 cup

soy sauce

1/4 cup

water

1/2 cup

sweet Japanese rice wine ((may sub mirin or dry sherry))

1/3 cup

granulated sugar

1/4 tsp

black pepper

1 tsp

Sriracha/Asian hot chile sauce (**)

2 tbsp

sesame oil, divided

zucchini, thinly sliced

red bell pepper, thinly sliced into 1/4 strips

yellow bell pepper, thinly sliced into 1/4 strips

2 cups

mushrooms, sliced

1/2 tsp

salt

1/4 tsp

pepper