a new restaurant serving belgian pomme frites, fried eggs and waffles . how could i not be drawn to such an appealing trio? saus , open less than one month, is located on union street , relatively close to fanueil hall, the north end and city hall. i had eagerly followed the progress of saus on twitter , and stopped by the other day for my first taste. and i will be returning. the restaurant is small, able to seat around 20 or so people, and has some interesting decor, lots of pictures of french comics. i like the decor, and think it injects some originality and personality into the space. you order your food at the counter, and the menu is small, concentrating onfritesand waffles. pommefritescan be ordered in three sizes, costing $4, $5.50, and $7, and you receive a free sauce with your order. additional sauces, of which there are at least a dozen varieties, cost $0.75 each. the sauces range from truffle ketchup to cheddar & duvel ale . you can also get poutine , in two sizes cost