Udon noodles stir-fry is a quick and flavorful dish made with thick, chewy udon noodles, fresh vegetables, and a savory sauce. This recipe combines garlic, onions, green beans, carrots, and broccoli for a mix of textures and nutrients. The sauce is a balance of umami, sweetness, spice, and nuttiness, using tamari (or soy sauce), chili oil, rice vinegar, maple syrup, and toasted sesame oil.