I know I say this about many recipes, but tomato and red pepper soup is hands down one of my favourite soups. I love it just as it is, or as a base where I can add little extras to change the taste slightly. For example, when I’m in the mood for a bit of spice, I might add in a fresh red chilli, or a pinch of dried chilli flakes.

Why You’ll Love This Recipe
- Quick & Easy – Just add everything to the soup maker and let it do the work.
- Healthy & Nutritious – High in protein, fibre, and vitamins from fresh veggies and lentils.
- Budget-Friendly – Uses simple, affordable ingredients.
- Customisable – Easily adjust for spice levels or alternative ingredients.
What You Need: Ingredients
Find the full measurements and concise instructions for making it in the recipe card below.
To make this warming soup, you will need:

- Tomatoes on the vine, chopped – Any variety works, including plum tomatoes or tinned tomatoes.
- Red peppers, deseeded and chopped
- Garlic – if you don’t have fresh you can use paste or chopped frozen garlic.
- Onion, chopped
- Red lentils, rinsed – Provides protein and thickens the soup naturally.
- Vegetable stock
How To Make Tomato and Red Pepper Soup In A Soup Maker
Lots of people ask me if I remove the skin from tomatoes before adding them to a soup – I don’t. The main reason I don’t remove the skin is that I really can’t be bothered (!) – but also, so much of the goodness is in the skin, why take it off? If you are worried about bits of skin in a smooth soup you needn’t be. If you are using a soup maker it will blend it up so smoothly, you won’t have any bits (unless you use the chunky setting of course!)

If you have time you can roast the tomatoes and red peppers before adding them to the soup maker. This really enhances the flavour, they can be roasted in an oven or air fryer.
Adding in the red lentils is optional. I occasionally add them in to thicken up a soup, they work really well! Lentils are a great option if you don’t want to use potatoes or cream to thicken up a soup.
Another optional step is sautéing the onions and garlic. If your soup maker doesn’t have a sauté function you can skip this step and just add everything into the soup maker at once and set it off on smooth. When I saut I tend to use a little olive oil.

Add all the ingredients to your soup maker, I like to use the chop function for the onions and garlic. I tend to add the vegetable stock directly to the soup maker and then add hot water up to the line. Remember to give everything a good stir too so that the water can get down to the bottom.
Set the soup maker off on smooth, it will take 30 minutes to run through it’s cycle – if you are using a different soup maker model it may take more or less time.
At the end of the soup maker cycle serve and season according to taste.

Tips and Serving Suggestions
- For a chunkier soup – Use the chunky setting or blend only part of the soup at the end.
- Ensure lentils are rinsed – This helps remove excess starch and prevents cloudiness.
- For extra depth – Roast the tomatoes and peppers before adding them to the soup maker.
- Avoid too much stock – If you prefer a thicker soup, start with less and add more after blending.
- Add Spice – Throw in a chopped red chilli for a spicy kick.
- Creamy Finish – Stir in a little coconut milk or crème fraîche.
- Top It Off – Serve with croutons, Greek yoghurt, or grated cheese.

Storage & Reheating
- Fridge: Store in an airtight container for up to 3 days.
- Freezer: Freeze in portions for up to 3 months. Defrost overnight in the fridge.
- Reheating: Warm on the stovetop or microwave until hot, stirring occasionally.
I hope you enjoy this recipe – let me know in the comments if you make it! You can also find some more soup maker recipes here.
If you would like to join a friendly bunch of soup makers and get some more soup recipe inspiration please feel free to join us over on my private Facebook group.

Tomato and Red Pepper Soup (in a Soup Maker)
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Ingredients
- 1 onion chopped
- 1 clove garlic crushed
- 6 tomatoes on the vine* chopped
- 2 red peppers deseeded and chopped
- 100 g red lentils rinsed
- 800 ml vegetable stock
Instructions
- Optional: saute the onions and garlic in a little oil.
- Add all the ingredients to your soup maker and stir all the ingredients together to make sure nothing is stuck to the base.
- Set the soup maker off on smooth.
Notes
Nutrition
Nutrition information is automatically calculated, so should only be used as an estimate.
Irene Livingston
Sunday 23rd of March 2025
I used a tin of pomodorini cherry tomatoes and a Knor spicy stock cube so easy to make definitely a favourite now
Robert Quee
Friday 7th of March 2025
Definitely one of my favorite soups. I don't use lentils though but powdered potato to thicken instead. Hadn't thought of putting a bit more spice so will try that. I also use garlic powder.
Jules
Wednesday 23rd of October 2024
This is a quick and tasty recipe, it has become my go to tomato soup with a spicy kick, I use my Ninja soup maker and sauté first add the rest of the ingredients and job done ! Easy. Thanks for sharing :)
Andrew McGinn
Wednesday 8th of May 2024
I tried your recipe in the Ninja. I replaced lentils with sweet potato and added a half teaspoon of paprika instead of chili flakes. It was delicious. Your recipies have been a great source for us since we got the Ninja. Keep them coming👍
Ross Rixon
Saturday 2nd of March 2024
Made a tomato and red pepper soup yesterday using a tin of tomatoes as we are struggling to find tasty fresh tomatoes at the moment. I added a very small piece of chilli, just enough for a touch of background heat and a shallot with some red lentils. No garlic because I discovered ours was past its best. The result on a cold and snowy day was enough to bring a smile to our faces. Since we bought the Ninja soup maker our soup consumption has changed dramatically. I make soup far more frequently and I am learning to use different ingredients and also to improvise more. So glad we made the change.
And thank you so much for your recipes. They are a great source of inspiration.
Liana Green
Monday 25th of March 2024
Hi Ross - I'm happy to hear you are enjoying your Ninja soup maker 🥰