While I was in Omaha, my husband and I had dinner at lot 2, a new-to-us spot in Benson.
They have several sides that are vegan or can be veganized, including Brussel Sprouts with candied lemon and chestnuts (hold the parmesan). Love the candied lemon.
For sandwiches, the Seitan Philly - jalapeno, mushrooms, onion + vegan worcestershire (hold the cheese) - is seriously delicious. Fries come on the side with housemade ketchup.
Benson is a great neighborhood - after dinner you can swing by the Waiting Room to catch a show or Beercade for some pinball.