My mother used to make this for us at least twice a week. I'm not sure where she got it but it's delicious and quick. You can substitute corn or carrots for the hominy but it's just not as good without the hominy.
I lost 70 lbs on a low-carb diet and really missed having mashed potatoes. This is a great substitute (especially if you like cauliflower) since it when mashed it is the same consistency as mashed potatoes.