Spoil-Resistant Hamburger Steak for Bento

• 1 Hamburger steak
• 1 Hamburger sauce
• 1 Hot cooked white rice
• 2 tsp Vinegar

1. When preparing the hamburger steak, add 2 teaspoons of vinegar per 300 grams of meat (2 hamburger steaks' worth).
2. "Youlinchi Chicken for Bento"This also uses vinegar to prevent spoilage.
3. "Beef-Wrapped Green Beans"If you add vinegar at the end, this will also become spoil-resistant.
4. "How to Prepare Rice for Bento"

steak, hamburger, white rice, vinegar

Taken from cookpad.com/us/recipes/150818-spoil-resistant-hamburger-steak-for-bento (may not work)