I am vising SF in August and would like to try some Dim Sum (not available where I live). Have done much searching on-line, but It seems that many of the recommended Dim Sum places are only open for lunch and/or are carry-out establishments. I have very limited time and we are only going to be available to go out for dinner on a Sunday and Monday evening. We are staying in the Union Square area. What would be a good option for Dim Sum on a Sunday or Monday evening?