Homemade Teriyaki Beef Stir Fry {Steak & Broccoli}

Ingredients

• 3 tablespoons reduced sodium soy sauce
• 3 tablespoons rice vinegar
• 1 tablespoon dark brown sugar
• 2 teaspoons ginger (grated )
• 2 garlic cloves (grated)
• 2 teaspoons cornstarch
• ¼ cup water
• 1 tablespoon avocado oil (divided)
• 1 onion (thinly sliced)
• 1 red pepper (thinly sliced)
• ½ cup water
• 3 cups broccoli florets (cut into bite-sized pieces)
• 1 pound flank steak (thinly sliced)
• ½ teaspoon salt
• ¼ teaspoon black pepper
• Steamed white rice (for serving)
• Sesame seeds (for serving)