I whole heatedly agree with every word of C.Libre this soup is great. I got the to go portion today and it was amazing.
Years of enduring cold, greasy soups at Chinese lunch buffets have lowered my expectations for wonton soup beyond reasonable human standards, so tasting Thanh Nhi's version was a revelatory experience. It's not as if the cooks have some secret ingredient or any other special tricks -- this is exactly what you might expect of a wonton soup, consisting of tender shrimp and pork dumplings in a clear chicken broth with chopped green onions and fried garlic. It's just that it's fresh and comforting, made with love by very nice people.
The appetizer portion is $2.50 and pairs nicely with a sandwich, making for one of the most satisfying cheap lunches you'll find in Austin.