I will second/third Kalpapruek for lunch. I have really enjoyed it! But be careful walking to and from your table if you are 5’8"/1.7M tall because there are low overheads.
Some others in BKK I would mention (most of which I got from Peter) are:
Sui Heng Chicken Rice
Ek Teng Phu Ki for Iced Ceylon Milk Tea and Toast Bread with Coconut Egg Custard
The Original Mae On for Green Curry and egg
Ten Suns for Beef Noodle Soup
Khao Kaeng Ruttana for anything in the assortment of dishes.
Rung Rueang off of Sukhumvit for pork noodle soup.
I am saving a bookmark of this discussion because it is really useful. Thanks to all!
Here is a link to my experience from a year ago.
