Ground Pork Stir-Fry

Ingredients: - 1 pound ground pork - 2 tablespoons vegetable oil - 3 cloves garlic, minced - 1-inch piece of ginger, minced - 1 onion, finely chopped - 1 bell pepper, diced - 1 cup snap peas or green beans, trimmed - 2 tablespoons soy sauce - 1 tablespoon oyster sauce - 1 tablespoon hoisin sauce - 1 teaspoon sesame oil - 1/2 teaspoon red pepper flakes (optional) - 2 green onions, sliced (for garnish) - Sesame seeds (for garnish)