Those squash that look like a flying saucer I think are called pattypan squash. A patty pan was a small pan used to bake pastry dough in.
Most mexican places around San Antonio serve rice and beans with their dishes.I have a mexican cookbook from the 40s I'll have to look at for recipes for,plus an old Gebhardt's chili powder cookbook.
It has a recipe for spanish carrots in it.You can do the roasted corn,or corn beans and squash. jimica salad would be good.
Don't know why most mexican restaurants serve just rice and beans.
I know they eat other veggies in Mexico.