Bouldin creek cafe
Pluckers
Mother's cafe
Hyde park grill
Galaxy cafe (in the triangle)
The oasis, highly recommend to go on a Sunday because they have live salsa music and good food with a great view over lake Travis
Hula hut (off lake Austin blvd)
Mozarts for coffee and pastries. (it's next to hula hut)
Summer moon for coffee, hand pies, and other speciality foods
Home slice off s.congress
Amy's ice cream
Phils ice house
Top notch burgers (featured in the film dazed and confused)
Dan's hamburgers (austin's version of whataburger)
Magnolia cafe (austins version of IHOP, highly recommend their "landscape" meals)
I'd avoid the food trucks on s. Congress. Most are very mediocre and expensive.
Don't automatically cross out bouldin or mother's because they are vegan/vegetarian restaurants. Both have amazing tasting food that is filling. This coming from a man who is very active and lifts/runs 5-6 days a week.