As far as Thai in the Park Slope-ish area goes there's one restaurant that truly has my heart and that would be Song. I know people who love Beet Thai, but to be honest, I've never given it much of a try. However, when they started offering Thai style sandwiches for $5, that got my attention...
Served up on a toasty baguette this spicy ground pork sub had lovely crispy bit of Thai basil. Intensely satisfying, this is a steal for $5. They also serve up Thai Omelet and Chicken Panang sandwiches, the former includes ground pork, egg and shrimp, delicious, if a bit messy.
On my last visit these sandwiches hadn't made it to the printed takeout menu, but I've been able to order them to go without a problem.
Beet 344 7th Ave Brooklyn, NY 11215 (718) 832-2338