Oyako-don's great stuff. Took me some experimentation to come up with the right proportion of egg to broth to chicken the first few times I made it... Since it sounds like the over-sweet broth's the biggest problem with the sukiyaki, here's another angle I'd try: disassembling the thing! Q1. How cooked are the vegetables? If they'd take another reheating without turning to mush, see option A. If they're pretty thoroughly cooked, see option B. Option A: Sukiyaki-don (I actually saw an idea like this in a Japanese-language cookbook, which surprised me, but I do it with leftover sukiyaki a lot. The cookbook version involved cooking the sukiyaki specifically for the donburi, but it's good with leftovers too) Drain the extra broth off the leftover sukiyaki, and make a couple tablespoons of replacement broth out of soy sauce and dashi to try to cut down residual sweetness. Heat the leftovers together with the replacement sauce and put over a bowl of hot rice and sprinkle some sesame seeds and chopped green onions on top. Option B: Two separate meals (pseudo-Korean donburi meal and fried rice meal): I've done this one before with some sukiyaki that had been simmering for quite a while at the end of a party. First, separate the meat from the vegetables. Pseudo-Korean donburi: Quick-reheat the leftover sukiyaki meat in a bit of canola oil scented with a few drops of sesame oil, and sprinkle sesame seeds on top. Put on rice along with some kimchi. (This works best if you like kimchi, of course. I love the stuff...) Dolsot-bibim-bab-style fried rice "hash browns": Reheat some leftover rice in the microwave. Cut up the vegetables and stir them through. If you have any shrimp handy, especially the tiny ones, toss those in too. Heat some sesame oil in the bottom of a nonstick skillet, pat the rice-mix into a pancake shape, and sizzle until golden brown and crispy, then flip and sizzle the other side. Top with anything you like -- a fried egg and gochuujang will make it more like a dolsot-less dolsot, but my dad likes his with ketchup and mustard (the heathen! Of course, I'm not one to talk since I invent transcontinental food all the time...)