My husband and I eat here almost every week for 2 years - our favorites include pad thai, green curry, pad thai wantons, stuffed chicken wings, panang curry... in fact, everything on the menu is good. Great homey feel and wonderful owners (a couple from Chiang Mai, Thailand). We've been to Thailand many times and the food here is absolutely authentic!!!
I think Lanna Thai restaurant is a hidden jewel in the Sunset district of San Francisco. The food is authentically prepared and served with a genuine homey feel. There is a daily lunch special which includes two entrees and a bowl of the house soup for $5.49. The same special is served at dinner time for only $8.49. My recommendation would be anything that is served with the peanut sauce. It is to die for! You can actually buy a jar of this ambrosia for only $4.95 as well... just don't drink it all before you get home!