This is another recipe to play with. I started with a can of tomato sauce, but I've also mixed tomato sauce and tomato paste. You can thin it out with water or broth. Depending on what you use, you may need more/less salt.
Remember, the key here is to make it to your family's taste.
Heat the tomato sauce (I used a microwavable dish on high for 1 minute). Whisk in the seasonings. Heat a bit more (microwaved on high for 30 seconds.) Let it sit for the flavors to develop. You can heat this some more to thicken it.
If you've added broth/water and it is too thin, you can add a thickening agent (1 tbsp flour + 1 tbsp water) and bring it to a boil.
You can omit the cocoa and onion, or increase any of the ingredients. Add a dash of cinnamon...play with it using what you have on hand. The cocoa powder gives it a nice dark color. Want it spicy? Add a dash of cayenne pepper or hot sauce.