My New Mexico roots go pretty deep. I often reply "Christmas" to that most New Mexican of questions: "Red or green?"
But I've never seen them mixed together in one bowl. It's not like that. Perhaps it's easier to understand if you think of it as: "Red sauce or green sauce on your enchiladas, huevos rancheros, chile relleno, mojarra...?"
Or if you were asked whether you prefer the chocolate or the raspberry sauce on your dessert crepes.
And you replied that you'd like a little of each.
In the case of the chile sauces, that would be, "Christmas."