Craving the tangy sweetness of catsup but watching your sugar intake? This sugar-free catsup recipe delivers all the classic flavor you love without a single gram of added sugar. Whether you are following a ketogenic diet, managing diabetes, or simply trying to cut back on refined sugars, this keto catsup recipe proves that healthy eating never has to mean sacrificing taste. In just 30 minutes, you can have a jar of rich, tangy keto catsup that rivals any store-bought brand.

Why Make Sugar-Free Catsup at Home?

Stevia Natural Sweetener Packets as a Plant-Based Sugar Substitute
Stevia Natural Sweetener Packets as a Plant-Based Sugar Substitutecc by-sa 4.0

A single tablespoon of standard commercial catsup contains about 4 grams of sugar — nearly a full teaspoon. That may not sound like much, but most people use far more than a tablespoon at a time. Over the course of a meal, those sugar grams add up quickly, especially if you are aiming to stay under 20 to 50 grams of net carbs per day on a keto diet.

While sugar-free catsup options exist on store shelves, they often contain artificial sweeteners, preservatives, and fillers that many health-conscious consumers prefer to avoid. Making your own sugar-free catsup at home puts you in complete control. You choose the sweetener. You choose the spice level. You choose the quality of tomatoes. The result is a cleaner, fresher-tasting condiment that fits perfectly into your low-carb lifestyle.

Sugar-Free Keto Catsup Recipe

A Nutritious Low-Carb Avocado Chicken Salad
A Nutritious Low-Carb Avocado Chicken Saladcc by 2.0

This recipe uses erythritol as the primary sweetener, though you can substitute with monk fruit sweetener, allulose, or a stevia blend. Each option produces a slightly different flavor profile, so feel free to experiment until you find your favorite.

Ingredients

  • 1 can (6 oz) tomato paste (no sugar added)
  • ½ cup water
  • ⅓ cup white vinegar or apple cider vinegar
  • 3 tablespoons granulated erythritol (or equivalent monk fruit sweetener)
  • 1 teaspoon onion powder
  • ½ teaspoon garlic powder
  • ¾ teaspoon sea salt
  • ¼ teaspoon ground allspice
  • ⅛ teaspoon ground cloves
  • ⅛ teaspoon ground cinnamon
  • Pinch of cayenne pepper (optional)

Step-by-Step Instructions

  1. Combine the base ingredients. In a medium saucepan, whisk together the tomato paste and water until smooth. Add the vinegar and whisk again until fully incorporated.
  2. Add the sweetener and spices. Stir in the erythritol, onion powder, garlic powder, salt, allspice, cloves, cinnamon, and cayenne pepper if using. Mix thoroughly to ensure even distribution.
  3. Simmer gently. Place the saucepan over medium-low heat and bring the mixture to a gentle simmer. Cook for 15 to 20 minutes, stirring frequently to prevent sticking or scorching. The catsup will darken slightly and thicken as it cooks.
  4. Taste and adjust. Remove from heat and taste. Adjust sweetener, vinegar, or salt to your preference. Keep in mind that erythritol can sometimes have a mild cooling effect — if you notice this, try blending in a small amount of allulose instead, which has a more neutral taste.
  5. Cool and store. Allow the catsup to cool completely. It will continue to thicken as it reaches room temperature. Transfer to a glass jar or squeeze bottle and refrigerate.

This recipe yields approximately 1 cup of finished catsup.

Nutritional Information (Per Tablespoon)

  • Calories: 8
  • Total Carbs: 1.5g
  • Net Carbs: 1g
  • Sugar: 0g added sugar (natural sugars from tomato paste only)
  • Fat: 0g
  • Protein: 0.3g

Best Sugar Substitutes for Keto Catsup

Not all sugar-free sweeteners are created equal, and each brings a slightly different character to your keto catsup. Here is a quick comparison to help you choose:

  • Erythritol: The most common keto sweetener. It measures cup-for-cup like sugar and has zero net carbs. Some people detect a slight cooling sensation, especially in uncooked applications. In cooked catsup, this effect is minimal.
  • Allulose: Tastes and behaves most like real sugar. No cooling effect and it caramelizes nicely. Slightly more expensive but many keto bakers consider it the gold standard.
  • Monk fruit sweetener: Very concentrated, so a little goes a long way. Often blended with erythritol for easier measuring. Clean, sweet taste with no aftertaste for most people.
  • Stevia: Extremely potent — use sparingly. Works best when blended with erythritol. Some brands have a noticeable aftertaste, so quality matters.

Tips for the Best Sugar-Free Catsup

  • Use high-quality tomato paste. Since this is a tomato paste-based catsup recipe, the quality of your paste matters enormously. Look for brands with only tomatoes listed as the ingredient.
  • Let it rest overnight. Like many condiments, this catsup tastes even better the next day after the flavors have had time to meld together in the refrigerator.
  • Add smoked paprika for depth. A quarter teaspoon of smoked paprika gives the catsup a richer, more complex flavor that compensates beautifully for the missing caramelized sugar notes.
  • Double the batch. This catsup disappears quickly. If you are feeding a family, consider making a double or triple batch right from the start.

Variations on Sugar-Free Catsup

Once you have the base sugar-free catsup recipe down, try these keto-friendly twists:

  • Sugar-free spicy catsup: Add a diced jalapeño or a tablespoon of sriracha. Check out our full spicy catsup recipe for more heat-packed ideas.
  • Sugar-free curry catsup: Stir in a tablespoon of curry powder for a curry catsup that pairs beautifully with grilled sausages.
  • Sugar-free smoky catsup: Add a teaspoon of liquid smoke and extra smoked paprika for a barbecue-inspired flavor profile.
  • Sugar-free garlic catsup: Double the garlic powder and add a tablespoon of roasted garlic paste for garlic lovers.

Frequently Asked Questions

How long does sugar-free catsup last in the fridge?

Stored in an airtight container, this keto catsup will keep for 3 to 4 weeks in the refrigerator. The vinegar acts as a natural preservative. For longer storage, consider our catsup canning guide, though you will need to adjust the recipe slightly for safe water-bath canning.

Does sugar-free catsup taste different from regular catsup?

There is a slight difference, but most people find it remarkably close to the real thing — especially after it has rested in the fridge overnight. The key is choosing the right sweetener for your palate and not skimping on the spices, which carry much of the flavor.

Can I use this keto catsup in other recipes?

Absolutely. This sugar-free catsup works beautifully in any recipe that calls for regular catsup, including our catsup glaze for meatloaf. Just be aware that the glaze will not caramelize quite the same way without real sugar, but the flavor will still be excellent.

Ready to explore more homemade catsup recipes? Our complete collection has something for every taste and dietary need.