Sweet and spicy stir-fry pork sandwich

Ingredients

• 1 pound pork shoulder or butt, thinly sliced
• 1/2 cup cornstarch
• 3 tablespoons vegetable oil or other neutral oil
• 1/2 yellow onion, thinly sliced
• 1 jalapeno, thinly sliced - divided
• 1/2 teaspoon salt
• 3 tablespoons soy sauce
• 2 tablespoons honey
• 1 tablespoon rice wine vinegar
• 3 cloves garlic, minced
• 1 teaspoon ginger, finely minced
• 1 teaspoon sesame oil
• 1/2 teaspoon red pepper flakes
• sandwich roll
• sweet and spicy pork
• jalapeno slices
• sesame seeds
• green onions, thinly sliced