Ingredients

• 1 tablespoon sesame oil (or you can use any vegetable oil)
• 1 bunch celery, cut into 1/2-inch slices
• 1/2 lb yellow onion, sliced into strips
• 1 teaspoon black pepper
• 1/8 teaspoon red pepper flakes
• 1 teaspoon powdered ginger
• 1 teaspoon salt (or to taste)
• 1 tablespoon brown sugar
• 1/4 teaspoon thyme leaves
• 1 1/2 cups water or 1 1/2 cups beef broth
• 15 1/2 ounces diced tomatoes (undrained)
• 1/4 cup cornstarch
• 1/4 cup soy sauce
• 1/4 cup water
• 3 large green peppers (you can use mix colors for a nice presentation)
• 1 lb round steak, thinly sliced into strips