Greeting fellow chowhounders. I am a New Yorker who will be spending Mother's Day weekend with my mother in SF. I'm looking to take her for a nice brunch or lunch on Mother's Day. We will probably be staying in the Union Square area and would prefer to stay in the city. Neither of us are into big buffets. The food should be good but nothing too adventurous and in the moderate to expensive price range (but not super expensive/elegant). I will appreciate all suggestions!! Thanks in advance.