Udon noodles are wheat noodles popular in Asia. They are readily available now at many larger grocery stores and at stores that specialize in Asian cuisines. If desired, substitute linguini or fettuccine for the udon noodles.
Substitute other vegetables as you prefer. For example, substitute a green bell pepper for the yellow one, or in place of the fresh vegetables, substitute a 1-pound bag of frozen stir-fry vegetables.