Phinney Ridge: 312 N 67th St, Seattle, WA 98103, T: (206) 783-6362.
Interbay: 1613 W Dravus St, Seattle, WA, T: (206) 284-6363
I was pointed to the delights of Red Mill Burgers by the fantastic tv program Man vs. Food. Its host, Adam Richman, was raving about their onion rings and burgers, so the next time I was in the neighborhood, I stopped by to sample the goods. Since then, I have been back three times, visiting both shops, and I live almost 5 hours away!
Red Mills Burgers does exactly what it says: burgers! It has a broad variety of burgers, including chicken and different veggie ones. They are famous for their verde burgers, made with freshly peeled and roasted Anaheim peppers. I had four different burgers at Red Mill: (1) the Red Mille Deluxe, a basic burger with their own "mill sauce"; (2) the Verde Burger, with fire roasted Anaheim peppers, (3) the BBQ Burger, with bbq sauce, and (4) the Bacon Deluxe, with bacon (duh!). In all cases the burgers were big, fresh, and juicy, but I prefered the 'simple' Red Mill Deluxe. Seriously, the burgers at Red Mill are so good, you don't need anything else than that! It costs $4.09 (excl. tax), but comes without any sides.
And talking about sides, not taking anything away from their burgers, but oddly enough, Red Mills Burgers stands out in its... onion rings! I am not even a fan of onion rings, but their Babe's Onion Rings ($2.59) are to die for! Do add a side of Tub O' Tartar Sauce ($0.23). If you have any space left, get a side of french fries ($1.89); as the onion rings, they are fried in 100% peanut oil. The fries are not special, but they are very decent. Finally, do not leave without a shake; they have many different tastes at $3.19 (I love their banana shakes!).
UPDATE: I can also vouch for the Red Onion Jam Burger, with baked red onions, and the BLT (on whole wheat toast and with thick peppered bacon). Both are YUM!
VERDICT: 92/100
The onion rings are, without a shadow of a doubt, the best I ever ate. Absolutely amazing! The fries are good, but no competition for the onion rings. The burgers are among the best I ate at a pig out spot, though I wasn't that impressed by the Verde or BBQ burgers. The milkshakes were really creamy and tasty.
If you are in Seattle, you MUST go to Red Mill Burgers! And once you are there, and have waited your turn (there is ALWAYS a serious wait!), do get whatever burger you want and do NOT leave without the onion rings and tartar sauce!