The short answer is yes, you can add water to tomato paste to create a more diluted tomato product, similar to tomato sauce or crushed tomatoes. However, the process requires a bit more nuance than just stirring water into the paste. Here's what you need to know.

Tomato paste is essentially tomatoes that have been cooked down and concentrated. The water content is removed, leaving a thick, dense product packed with the natural sweetness and acidity of tomatoes. This makes tomato paste a potent flavor booster that can be diluted or used in small amounts to add richness to dishes.
To transform tomato paste into something closer to tomato sauce, you can mix it with water at a ratio of about 1 part tomato paste to 2 or 3 parts water. This will give you a thinner, more sauce-like consistency.

For example:1 tablespoon of tomato paste mixed with 2-3 tablespoons of water will create about 3-4 tablespoons of a tomato sauce-like product.
If you're trying to replicate the consistency of crushed tomatoes, you may need to add a bit less water to keep some thickness, about 1 part tomato paste to 1-1.5 parts water.
While diluting tomato paste with water will mimic the consistency of tomato sauce or crushed tomatoes, the flavor may still be more intense. Tomato paste has a concentrated tomato taste, so you may want to adjust the seasoning in your recipe. Consider adding:A pinch of sugar to balance the acidity.Herbs and spices like garlic, basil, oregano, or bay leaves to build a more complex sauce.Cooking the mixture for a few minutes can help marry the flavors and reduce any raw tomato taste.
Though you can successfully use diluted tomato paste as a substitute for other tomato products, it's worth knowing when it's best to stick with paste or opt for other forms of tomatoes.
Use tomato paste when you want to add depth of flavor or thicken a dish without much liquid (e.g., stews, soups, or thick sauces).
Use tomato sauce when you need a thinner base for dishes like pasta sauce, pizza sauce, or soups.
Use crushed tomatoes when you want texture and body in your dish (e.g., chunky sauces, chili, or casseroles).

So, can you just add water to tomato paste? Absolutely! By mixing tomato paste with water in the right ratio and adjusting seasonings, you can create a suitable substitute for tomato sauce or crushed tomatoes. Tomato paste is a versatile kitchen staple that allows for flexibility in cooking, making it a handy ingredient to have on hand.
Next time you find yourself without tomato sauce, grab that can of paste and a little water-you'll be surprised at how well it can fill in!
