After a (long) break, I'm trying to get back to making bento - just a simple one, made with one of my favourite bento staples - Beef and Tofu meatballs (you can't taste the tofu at all, but adding tofu makes the meatballs juicy, even after it has been frozen and re-fried). Here, they have been glazed with homemade teriyaki sauce. The rest of the bento is just some edamame, a happy hard boiiled egg, and rice. Simple, but filling and tasty.
4 Tbsp soya sauce
3 Tbsp sake
3 Tbsp mirin
2 Tbsp sugar
Mix all the ingredients together in a small frying pan, and heat over medium heat until bubbling. Keep the sauce bubbling (adjusting the heat lower if necessary) until the liquid reduces and thickens. Add the meatballs and coat with the sauce. (If you are defrosting the meatballs, make sure you fry them until the meatballs are fully heated through.)