Mata Hari on Dairy Ashford just a couple miles north of Westheimer.
The Indonesian General Consulate of Houston also supposedly has an open cafeteria on the weekends.
And Tai Pei restaurant on Holcombe just a few blocks westbound of Kirby also has an almost full Indonesian menu on the weekends. At nights at this place, you can get a few Indonesian items. Tai Pei is a Chinese restaurant run and owned by Indonesians.
The owner tells me that his girlfriend goes to school at night, and is only able to cook on weekends. But Tai Pei is run by Indonesians who don't believe in eating meat.
So for meat go to Mata Hari.
Try the rendang, it is a beef cut with a spicy coconut marinade. It's excellent but I've been veggie-oriented lately.
The nasi goreng is a shrimp-style Indonesian variation of fried rice.
And maybe try the rijstaffel. It is like a big sampler of the different Indonesian dishes that they drop on your table.