I stopped by the tiny eatery called Jeannine's Bistro at 106 Westheimer and got a pot of mussels steamed in white wine and a big paper cone full of excellent Belgian frites with homemade mayonnaise the other day. The large order, which comes with two dozen mussels, is a bargain at $19. It's a nice lunch or light supper for two. You also get a basket full of crunchy bread to dunk in the mussel-flavored wine stock at the bottom of the pot.
There's a great selection of Belgian beers, and most of them are half-price during happy hour. Jeannine's also offers some very affordable three-course dinner specials. Try the crème brulée crepe or the profiteroles for dessert. Jeannine's Bistro and Broken Spoke are the dueling Belgian moules frites restaurants in town.