Let us first be clear what tomato broth is not. It's not a tomato sauce and it's not a tomato soup.
A soup is a full-bodied dish that could be a meal. A broth is a light flavored memory of the original and is watery and thin but full of flavor. The lines are blurred in the middle but seldom has one been mistaken for the other.
Also since we are all friends here, you can't get from one to the other. A broth is definitely not a diluted soup although you can make an intense soup using a broth because it will, no surprises here, intensify the flavor.
Perhaps the best way is to think of broth is intensely-flavored water that has both nutrients and taste.
Now that the CC has gotten that mini-rant off his chest, it's time to proceed.
1 medium red onion (diced very fine)
4 cloves garlic (crushed)
1 lb tomatoes (passed through a food mill)
"seasonings" (rosemary, sage, oregano, etc.)
Fry the onion and the garlic at very low heat for at least 10 minutes. Add the tomato purée, salt and pepper and fry for a bit. Let it reduce at a low heat for the better part of 20-25 mins. All the taste comes out of this extreme reduction so deal.
Add the water to dilute it to the required consistency, and let it come to a boil.
This is the point in time you can add "seasonings". Let it simmer on a low heat for 20 mins.
You need to pass the stuff through a strainer to get the broth. Dilute further if necessary.
Tortellini en Brodo
1 package tortellini
2 cups tomato broth
If you are going to make your own tortellini, more power to you. The CC gets his from Raffetto's. There are limits to his ambition.
Cook the tortellini as per the instructions. Undercook by a minute or so. They will get heated up in the broth.
Meanwhile, bring the broth to a boil. Add additional herbs if needed, salt and pepper to taste. Drop the cooked tortellini and let it cook for a minute. Serve with plenty of grated parmesan and black pepper.
Poached Cod in Tomato-Tarragon Broth
2 cod fillets
2 cups tomato broth
1/4 cup chopped tarragon
Note 1: This is the lazy person's approach to dinner. Of course, you would've needed to have made the broth ahead of time but you do have a freezer, don't you?
Note 2: If you have never poached fish before, add 1/2 cup of white wine. The wine and the water will form an azeotrope and lower the boiling point to about 80°C from 100°C which is where water boils. It's a lot more forgiving if you're a "poached fish" newbie.
Heat up the broth with the tarragon. Add salt and pepper to taste. Poach the cod fillets until they are done. (This depends on the size. They are done when you can pierce them with a knife cleanly.)
Poached Eggs in Tomato Broth
dried out crusty bread
3 cups tomato broth
Note 1: This is the greatest "hangover" recipe in the CC's repertoire. After a night of carousing, this is both easy on the stomach and wonderfully nutritive (not to mention it provides the much-needed water element.)
This works the same way as the cod recipe above except you poach the eggs rather than the cod.
You serve it over the crusty bread on which you place the poached eggs and gently pour the broth around it. It's amazing to eat the yolk when it breaks over the bread and the broth.