Hi, Donna,
If you're a foodie, you're going to find great meals in all the many wonderful cities along the route -- Sevilla, Caceres, Merida, Salamanca, Zamora, Ourense. They all have a strong tourism base, which always means upscale restaurants. I have been to some in those cities, but never while walking, and I'm sure you'll have no trouble finding the currently popular spots. Food in Spain is just as trendy as food in other places, in my experience.
I can recommend a few basic home cooking spots in places where you are not likely to find too much choice.
In Montamarta, the Bar Rosamary, on the way out of town, is hands down better than the alternatives you will pass as you go through town. Owned by two women, high quality, lots of produce.
In A Gudina -- Oscars is one of those places with a 10 euro menu del dia, filled to the rafters with workers. Workers and pilgrims seem to have the same dietary needs -- big filling meals, home cooked always better. That's this place.
Xunqueira de Ambia -- Bocateria Beje, a small place on the side of the road, you will pass it on the way into town from the albergue (which is very nice). Another place owned and operated by two women (who used to be textile workers, lost their jobs, had to find a way to make a living, they are great at what they do and care very much about it). Meals available any time they are open, always good home cooked food. I was told by my French companions the last time I was there that they had a couple of very nice wines, but I am not much of a wine snob, so all I can tell you is that the wine was very good.
Puebla de Sanabria is a touristy town with lots of expensive hotels, and I'm sure you'll find foodie places there as well. The local beans form the basis of many dishes.
I'll hunt through my notes for some more recommendations. Buen camino, Laurie