Vegan Pepper Steak Soy Curls

Name: Vegan Pepper Steak Soy Curls
Ingredients: 1 1/2 tablespoons refined avocado oil; 1 large white or yellow onion (thinly sliced); 1 green bell pepper (thinly sliced); 1 red bell pepper (thinly sliced); 3 tablespoons vegetable broth; 1 tablespoon cornstarch; 3 tablespoons tamari or soy sauce (plus more as needed); 1 tablespoon unseasoned rice vinegar; 1 tablespoon brown sugar; 2 teaspoons minced or grated peeled fresh ginger; 2 cloves garlic (minced); 51/2 cups / 700g Basic Soy Curls; Crushed red pepper flakes for sprinkling (optional); 4 cups cooked white or brown rice or cooked udon or soba noodles (for serving)