I am certain that Red Mill Burgers has THE best hamburgers on this planet. Or at least they're in the top 5.
The serving sizes are huge, and everything is made to order. When you get your food, it will be piping hot, no doubt.
The lines can get long at lunchtime and there isn't alot of room to sit. You may have anticipated being able to go to Red Mill and eat in, but if you go during the wrong time of day you will have to eat in your car.
Parking spaces are not numerous either, but then again, this is Seattle.
They do not accept credit cards, and don't have an ATM on site. THey do take cash and check, however.
Do not even think about talking on your cellphone while in the restaurant. They (the workers) will come up to you and tell you (not ask) that you either leave the restaurant, or stop chatting. That's fine, though. I don't mind not having to hear my neighbor's lunchtime conversation about his recent colonoscopy.
Call ahead if you plan on take away. It's faster and you don't have to stand in line.
They have a menu that spans everything from chicken to burgers to veggie burgers. Tons of milkshakes in nearly every flavor on the planet.
Very good locally owned place. When you go there, you're around locals who shun the big-time burger joints for a place that is inexpensive AND good.