Is yaki udon the same as yakisoba?
Not quite. Both are typically wheat noodles, but they are built different. Yakisoba uses thinner, springy Chinese-style wheat noodles (often steamed and lightly alkaline), while yaki udon uses thick Japanese wheat udon, so you get that chewy, cozy bite that feels more substantial.
What udon should I buy?
Frozen udon is my favorite for texture. Shelf-stable vacuum-packed udon works great too. If you use dried udon, cook it fully and rinse briefly to remove excess starch, then drain well.
How do I keep the noodles from getting mushy?
Three rules: do not over-boil, drain well, and stir-fry fast over high heat. Also, do not dump noodles into a pan full of watery vegetables. Cook veggies first, then add noodles and sauce. If your pan is crowded, cook in batches so everything stays hot and glossy instead of turning into a steamy pile.
Can I make it vegetarian?
Yes. Use tofu or extra mushrooms and swap the sauce add-ins as needed. If you finish with bonito flakes, skip them for vegetarian. Add a little extra umami with a small spoonful of miso stirred into the sauce.
What can I use instead of mirin?
Best swap: sake (or dry sherry) plus a pinch of sugar. Use 2 tablespoons sake plus 1 to 2 teaspoons sugar in place of 2 tablespoons mirin. Mirin-style seasoning also works if you have it. If you are in a true pantry situation, you can do rice vinegar plus a pinch of sugar for a sweet-tang approximation (start with 1 tablespoon rice vinegar and 1 teaspoon sugar), but it is not a true mirin stand-in.