Fortunately, thickening a runny tomato sauce is as simple as letting it just simmer for longer. It's not the fastest process and can sometimes take over 20 minutes. However, it doesn't require ...

You are essentially making a type of roux sauce. Ladle in spoons of the hot cooking stock to the saucepan and stir constantly until you get a runny sauce-like texture. Stir in 1 tablespoon of ...