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Delicious fat free slow cooker tomato sauce. Perfect for pasta and pizza.
4.89 from 9 votes

Fat Free Slow Cooker Tomato Sauce (Marinara Sauce)

This throw it all in and forget it recipe for a rich and intense fat free slow cooker marinara or tomato sauce will become a freezer staple. Perfect for pizzas or pasta, it's a simple slow cooker recipe that delivers scrumptious results every time. Gluten free and vegan. 
Servings: 12 people
Prep Time5 mins
Cook Time8 hrs
Total Time8 hrs 5 mins


  • 800 g canned tomatoes - 2 cans
  • 3 medium tomatoes - roughly chopped
  • 1 small onion - peeled and roughly chopped
  • 3 garlic cloves - peeled and sliced in half
  • 2 tbs tomato puree
  • 2 stalks fresh basil
  • pinch dried oregano
  • salt and pepper - (to taste)


  • Simple pop all the ingredients into your slow cooker, and stir.
  • Cook on low, with the lid on, for about 8 hours or overnight.  If needed cook for another hour or two with the lid of the slow cooker slightly ajar to reduce further.
  • Blitz to a smooth sauce with a stick blender. 
  • Allow to cool before packing into tubs, glass jars or ice cube trays ready for freezing.


This is such an adaptable recipe and really is as simple as throwing it all in the slow cooker and leaving it to cook.
For a touch of heat add a pinch of chilli powder - take care though as the long slow cooking will intensify the heat.
You will get better results from using a mid range brand of canned tomatoes, not the most expensive, but not the cheapest which can be watery and taste metallic.
Freezes well.
All slow cookers behave differently, the sauce may need more or less time depending on the wattage and if your cooker has any hot spots.
• Please note that the nutrition information provided below is approximate and meant as a guideline only.
• Unless stated otherwise cup conversions have been made with an online tool. For accuracy please check with your favoured conversion tool. We recommend buying inexpensive digital kitchen scales.
Calories: 27kcal | Carbohydrates: 6g | Protein: 1g | Sodium: 89mg | Potassium: 236mg | Fiber: 1g | Sugar: 3g | Vitamin A: 240IU | Vitamin C: 8.2mg | Calcium: 25mg | Iron: 0.9mg