Ming Sheng Coffeeshop
Blk 828, Tampines St 81, 01-254
8am-7.30pm
Closed on alternate Mondays
and
Address
Blk 820 Tampines St 81, 01-506
Chin Tai Eating House
8am-7pm, closed on alternate Wednesdays
(son in law's version)
both are $1
makansutra.com have more 
http://www.makansutra.com/reviews/260207/index.html
very nice taste
rather filling also, not like those $1 also giam siap 1