This may be ranging a little far North for you, but it's worth the post. Las Camelias 925 Lincoln in San Rafael. I'm not going to go into huge detail, because it's been 2 years since I've been there. Every time Tanya and I plan to go something goes awry. I remember the sangria was good too.
I got spoiled on homemade mole. When a dear friend of mine got married in 1999 mole was the entree at the rehersal dinner. There is nothing like big events with mexican families. Heaven. I was introduced to mole years ago at an old girlfriends family event. I was the lone gringo at her little sisters Quinciera. Chowhound heaven! It was one of those experiences that we as chowhounds search for. Handmade tortillas fresh off the fire, rich savory carnitas, dark complex sinister looking mole. That sauce had a complexity that I may never experience again.
First off, I have to give many many thanks for the great suggestions I've found on this board. I just found Chowhounds a couple of weeks ago and I've already gleaned so much from your collective knowledge.
Now it's my time to give back:
Tio Felipe's Taqueria
620 E Evelyn Ave, Sunnyvale, CA 94086
I'm not sure if Sunnyvale is still considered the Peninsula, but if you happen to be down that way, this is a small hole-in-the-wall place in a strip mall, and the mole sauce here is as close to perfection as I've tasted. It's dark, rich and slightly smokey, served over succulent white chicken with tortillas on the side. Even my trips to the Yucatan haven't yielded a sauce as perfect. (imho)
I'd love to find good mole somewhere closer to SF, so I look forward to the suggestions you receive.