Krua Khun Puk is on the corner of Soi 11/1 and Sukhumvit Road - i've been there many times. 50 Baht for a bowl of their braised pork noodle soup, most stir fries are 80 Baht.  

Where exactly is this place?

Geez Rocco, you must be as skinny as a rake! I find I need at least 2 meals a day

Yep, you are right, I wrongly put 200 baht....it was in fact 100 baht. Fantastic value....edited the post.

I normally eat there at least once a month and always get pad krapow moo with a fried egg and a Coke Zero for 100 baht. Food is always very good. Sitting on the outside counter is perfect for people watching if it’s not packed.