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homemade ketchup with fresh tomatoes

How to Make Sugar Free Homemade Ketchup with Fresh Tomatoes

Learn how to make homemade ketchup without sugar. This homemade ketchup recipe is naturally sweetened, and it’s low in calories and carbs. It has a bold tomato flavor that goes perfectly with sandwiches or anywhere you need to use ketchup.

homemade ketchup with fresh tomatoes

No Sugar Homemade Ketchup with Fresh Tomatoes

Have you read the label on store bought ketchup lately? Most brands have a lot of sugar and even preservatives. Many are also sweetened with high fructose corn syrup, which I actively try to avoid in my diet. Instead of going without this classic condiment, I decided I’d make my own homemade ketchup recipe.

Not only is this recipe for homemade ketchup sugar free and naturally sweetened, it is also low carb with fewer calories. In addition, you’ll find that it also has a fresher flavor than its store bought version as it uses fresh, natural ingredients. As a result, it is typically also higher in nutrient rich vitamins and minerals.

Is Homemade Ketchup Better?

If you’ve never had healthy homemade ketchup, then you’re in for a fun treat. Since this tomato ketchup recipe is made from real tomatoes and fresh spices, it has a bold, robust tomato flavor. You can also taste the spices in this sugar free ketchup recipe.

This no sugar homemade ketchup is also a healthy ketchup alternative. It is sweetened naturally with monk fruit, so it’s sweet without adding any calories or extra carbs. Additionally, unlike sugar, monk fruit won’t impact glucose levels. Therefore it’s a great alternative for those with diabetes as well.

How Do You Make Sugar Free Ketchup From Scratch?

Making a sugar free ketchup recipe is actually easier than you might think it is. You don’t need any special equipment. You just need a saucepan to learn how to make homemade ketchup without sugar.

To make sugar free ketchup from scratch, you can substitute monk fruit sweetener for the sugar in your recipe. Or you can try my tried and true recipe for sugar free ketchup below.

sugar free ketchup recipe (1)

How to Make Slow Cooker Ketchup From Fresh Tomatoes

This homemade ketchup recipe is easy to make, but it does take about an hour. You’ll also have to stir it as it cooks. If you don’t want to spend time hanging around the stove for an hour, you can use a slow cooker to make ketchup instead.

It’s easy to make homemade ketchup without sugar in a slow cooker. Here is how to make slow cooker ketchup using fresh tomatoes:

  • Simply use the same recipe and place all ingredients in a slow cooker.
  • Then cook the ingredients uncovered on low for 10 to 12 hours.
  • Once cooked, simply use an immersion blender to blend the small pieces.

Is Sugar Free Ketchup Keto Friendly?

Yes, sugar free ketchup is keto friendly. you can use this sugar free tomato ketchup if you are following a keto or low carb diet. It’s naturally sweetened with monk fruit sweetener, which has net zero carbs and no calories.

healthy homemade ketchup

Will Homemade Ketchup Thicken as it Cools?

Your sugar free homemade ketchup will thicken slightly as it cools. However, it’s important to remove as much water as you can while simmering.

If it’s too thin once it cools, then simply reheat to remove more water.

How Do You Thicken Homemade Tomato Ketchup?

The best way to thicken a homemade ketchup recipe is by simmering off excess water. Otherwise, you’ll need to add flour, cornstarch, or arrowroot powder. These ingredients work well to thicken a recipe for homemade ketchup, but they are high in carbs. Do not use them if you are following a low carb or keto diet.

sugar free homemade ketchup

How Long Does Homemade Ketchup Last?

This homemade ketchup recipe will last for about two to three weeks in the fridge. To help it last longer, sterilize the jar for 10 minutes in boiling water before putting the healthy homemade ketchup in the jar.

I would like to offer a word of caution if you plan on boiling the jar. Not all jars can be reheated or boiled. I’m all for reusing glass jars that came with other foods in them, but some glass is meant to be heated just once and can’t be reheated again. If you boil it, the glass could burst.

I recommend using canning jars if you plant to boil the jar for your homemade ketchup with fresh tomatoes. Canning jars are made for heating over and over again.

How Can I Get My Ketchup to Last Longer?

You can sterilize the jar before bottling your sugar free ketchup recipe as mentioned above. You can also freeze this healthy ketchup alternative. It is good in the freezer for up to 6 months. It may separate when it thaws, but just stir it after it thaws.

sugar free tomato ketchup

Can You Can This Sugar Free Tomato Ketchup?

No, I do not recommend canning this no sugar homemade ketchup. It makes a small batch of two cups of homemade ketchup, so it’s not enough to can anyway. This recipe hasn’t been tested for pH, and tomatoes are a borderline low acid food. The vinegar may not be enough to get the pH within the safe range.

You can, however, freeze this recipe for homemade ketchup. It freezes well for up to six months.

You could also follow safe canning directions to can tomatoes to use to make the best sugar free ketchup recipe later. You can also freeze tomatoes to use later for a fresher taste. This allows you to make homemade ketchup with fresh tomatoes even when tomatoes aren’t in season.

Homemade Ketchup Variations

This sugar free homemade ketchup is a base recipe, and you can modify it to suit your taste. Try one of the following when you make your tomato ketchup recipe:

  • Substitute the monk fruit for stevia, coconut sugar or your favorite sugar substitute. You may need to make adjustments. I recommend adding less sweetener and letting it simmer and then adding more to taste.
  • This recipe calls for red wine vinegar. You can also use balsamic vinegar, distilled white vinegar or apple cider vinegar for a different flavor.
  • Add honey, BBQ sauce, or sriracha for a different flavor.
  • You can also add more or less of the spices to adjust for your taste.

homemade ketchup ingredients with fresh tomatoes

Sugar Free Homemade Ketchup Ingredients

To make the best sugar free ketchup, you will need:

how to make homemade ketchup (1)

How to Make A Sugar Free Ketchup Recipe

1. Pour a large drizzle of olive oil into the pan. Heat a saucepan over medium heat on the stovetop.

2. While the pan heats, prep the vegetables by finely mince the garlic using a knife or garlic press. Then dice the onions and chop the tomatoes. (There’s no need to peel the tomatoes.)

saute garlic and onion on stovetop in pan

3. Once the saucepan is hot, add the minced garlic to the olive oil. Heat while stirring, until fragrant, one to two minutes.

4. Now add the diced onion to the saucepan. Stir while heating. Cook for several minutes, until the onion is translucent.

cook down fresh tomatoes to make homemade ketchup without sugar

5. Next, add the chopped tomatoes to the saucepan with the garlic, onion, vinegar and paprika. Simmer for 20 minutes, then add the monk fruit and sea salt to taste.

6. Simmer the ingredients an additional 10 minutes, or until the ketchup has reduced by half. If it’s too watery, stir and keep heating until it reaches the desired consistency. It will thicken slightly as it cools.

puree no sugar ketchup in blender

7. Once, thickened, use an immersion blender to blend until smooth. (You can also allow the mixture to cool, then use a food processor or blender for this step.) Add more salt as needed, to taste.

8. Remove the sugar free homemade ketchup from heat. Then allow to cool slightly. Pour into an airtight container such as a canning jar.

How to Store Healthy Homemade Ketchup

Store this healthy homemade ketchup in the refrigerator, in an airtight container, for up to three weeks. (Or 4-5 weeks if using a sterilized mason or pantry jar.) Alternately, you can also store this healthy ketchup alternative in the freezer up to six months.

Yield: 2 Cups

Homemade Ketchup Recipe without Sugar

no sugar homemade ketchup recipe (1)

How to make homemade sugar free ketchup recipe. This healthy homemade condiment is naturally sweetened and made using fresh tomatoes for bold flavor.

Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes


  • 2 lb. ripe tomatoes, chopped
  • 1 yellow onion, peeled and diced
  • 1 Tablespoon olive oil
  • 2 Garlic cloves, minced
  • ⅓ Cup granulated monk fruit sweetener
  • ¼ Cup red wine vinegar
  • ½ teaspoon sea salt, fine ground
  • ½ teaspoon smoked paprika powder


  1. Heat a saucepan over medium heat. Drizzle olive oil in the pan. Add chopped garlic or use a garlic press to make minced garlic. Heat while stirring until fragrant.
  2. Chop the onion and add it to the saucepan. Stir while heating until the onion is translucent. 
  3. Chop tomatoes and add them to the saucepan with the garlic, onion, vinegar and paprika. Simmer for 20 minutes then add the monk fruit and sea salt to taste.
  4. Simmer an additional 10 minutes or until it has reduced by half. If it’s too watery, stir and keep heating until it’s the desired consistency. It will thicken slightly as it cools.
  5. Use a stick blender to blend until smooth. You can also let it cool and use a food processor or blender. Add more salt as needed.  
  6. Remove from heat and let the sugar free homemade ketchup cool slightly. Then pour into a container. 
  7. Store in the fridge up to three weeks or in the freezer up to six months.


If desired, you can substitute regular granulated white sugar for the monk fruit sweetener.

Balsamic vinegar can also be substituted for the red wine vinegar.

Nutrition Information:



Serving Size:

1 Tablespoon

Amount Per Serving: Calories: 12Total Fat: 0gSaturated Fat: 0gTrans Fat: 0gUnsaturated Fat: 0gCholesterol: 0mgSodium: 35mgCarbohydrates: 2gFiber: 0gSugar: 1gProtein: 0g

This condiment recipe originally appeared on Becca Ink.

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