Lunch in Riverside - elegant and good food?

[pambrain]

I will be taking a good friend out to lunch on a weekday - she lives near Riverside. I would like to have this be great food in a gracious atmosphere - outside if it is not too hot. The Mission Inn has been our default lunch place - is there an alternative - either in Riverside or any of the surrounding communities?

[glbtrtr]

Mission Inn is so special, I would just enjoy it and look no further.