Batch cooks controlling the seasoning
If you make several portions of sauce, stew, curry or soup at once, a plain tomato base lets you account for salt added elsewhere in the recipe.
Who is this for?
Shoppers comparing salt on labels
Salt per 100g provides a common basis for comparing tins. The amount you put into the pan matters too, particularly when a recipe uses several cans.
Meal preppers choosing a texture
Chopped tomatoes provide pieces for a sauce or stew; whole peeled tomatoes need crushing or blending if you want smaller pieces. A pre-flavoured tin is less flexible when portions will become different meals.
What should you check?
Compare the salt figure first, then work out how much tomato the recipe uses and whether its texture and seasoning suit every planned portion.
| Priority | What to check | Your needs |
|---|---|---|
| Salt per 100g | Compare the same nutrition measure on each exact product. ASDA lists 0.01g salt per 100g for both its standard and Just Essentials plain chopped 400g tins; Marks & Spencer lists 0.02g for its Chopped Italian Tomatoes 400g tin. | I want to choose the tomato base before deciding how to season a multi-portion recipe. |
| Quantity used | Check the tin size and the label’s measurement basis. For a 400g tin with values given per 100g, multiply that value by four to calculate the salt from the tomatoes alone. | A half-tin serving figure will not tell me what several full tins add to my batch. |
| Texture and flavour | Check whether the tomatoes are chopped, finely chopped or whole, and read the ingredients on flavoured tins. Mutti lists 0.30g salt per 100g for Polpa; ASDA lists 0.10g for its Chopped Tomatoes with Herbs. | I may want tomato pieces in a stew, a finer sauce, or a plain base that I can flavour differently for separate meals. |
| Leftovers | Choose a tin size that fits the recipe and follow that product’s opened-tin instructions. Marks & Spencer specifies refrigeration in a non-metallic container and different use-within periods for its standard and organic chopped tomatoes. | If I use only part of a tin, I need a plan for the remainder rather than assuming every product has the same storage instruction. |
Common buying mistakes
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Using the product description as a salt comparison
Words such as “Italian”, “organic” and “with herbs” describe other aspects of a tin. Mutti lists 0.30g salt per 100g for Polpa, while ASDA lists 0.01g for its plain chopped tomatoes.
Compare salt per 100g on the exact product before choosing by origin, texture or flavour.
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Comparing a stated serving with a whole batch
A half-tin value describes less tomato than a recipe using one or several full tins.
Multiply the per-100g salt figure by the grams of tomato you will use, then divide by 100. Account for other ingredients separately.
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Pre-flavouring every portion with the same tin
Added herbs or garlic may suit one dish but restrict how you use the rest of a batch. ASDA lists 0.10g salt per 100g for its herb chopped tomatoes, compared with 0.01g for its plain version.
If portions are destined for different meals, consider starting with plain tomatoes and adding flavour when you divide or use them.
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Leaving unused tomatoes in the opened tin
The cited Marks & Spencer and Sainsbury’s product instructions specify transferring leftovers to a non-metallic container and refrigerating them; their stated use-within periods differ.
Follow the instruction on the tin you bought and mark the container with the day it was opened.
Brand and retailer references
These examples show why the exact product label matters more than a brand name when comparing salt.
ASDA
ASDA’s standard and Just Essentials plain chopped tomato 400g tins both list 0.01g salt per 100g.
- Both cited plain products list tomatoes, tomato juice and citric acid.
- ASDA Chopped Tomatoes with Herbs are a different product and list 0.10g salt per 100g.
M&S
Marks & Spencer lists 0.02g salt per 100g for Chopped Italian Tomatoes 400g and 0.03g for its organic version.
- Both cited tins have product-specific nutrition and opened-storage instructions.
- The standard product says to use refrigerated leftovers within 3 days; the organic product says within 2 days.
Sainsbury's
Sainsbury’s lists own-label and branded tinned tomatoes. Its Chopped Tomatoes 227g product lists 0.07g salt per 100g.
- The cited 227g tin offers a smaller quantity when a recipe does not call for 400g.
- Check the separate nutrition label if choosing Sainsbury’s 400g chopped tomatoes; the 227g figure does not describe that product.
Napolina
Napolina offers chopped, whole plum and flavoured tomato formats for different recipe textures.
- Napolina describes its plain chopped tomatoes as chunky and suited to thick sauces.
- Napolina’s published information lists 0.10g salt per 100g for its garlic and herb chopped-tomato variants; check the exact tin rather than applying that figure to the whole range.
Mutti
Mutti describes Polpa as finely chopped tomatoes for uses including sauces, stews and soups.
- Its fine pulp offers a different texture from visibly chunky chopped tomatoes.
- Mutti’s Polpa product information lists sea salt among its ingredients and 0.30g salt per 100g. That figure must not be applied to other Mutti tins.
Tesco
Tesco’s chopped-tomato category lists own-label, Napolina and Mutti options, including Tesco Organic Italian Chopped Tomatoes 390g.
- The listed formats give shoppers different pack and brand options to compare.
- An organic description does not establish the salt figure; read the nutrition panel on the exact Tesco product.
Joybuy tomato options
These tins include chopped tomatoes for a ready-to-use batch base and whole peeled tomatoes that you can crush or blend when a recipe needs smaller pieces. Compare the current salt label on each product before choosing for a reduced-salt recipe.
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Laila Canned Chopped Tomatoes, 12 x 400g
Chopped tomatoes in a 12-can pack for repeated batch recipes. Check that the pack size fits your storage space and compare the current salt figure per 100g before buying.
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Mutti Peeled Tomatoes 400g
This single tin contains whole peeled tomatoes rather than chopped ones. Crush or blend them if the batch needs smaller pieces, and check this product’s salt label rather than using the figure for Mutti Polpa.
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Napolina Chopped Tomatoes, 4 x 400g
Four 400g tins provide a chopped format for recipes using more than one can. Read the nutrition and ingredient labels on this plain product rather than applying figures from Napolina’s flavoured variants.
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Laila Canned Plum Tomatoes, 12 x 400g
This 12-can pack contains whole plum tomatoes, so allow for crushing or blending if the recipe calls for chopped pieces. Consider storage space for the pack and check the salt figure on its current label.
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Napolina Peeled Plum Tomatoes, 4 x 400g
Four tins of whole peeled plum tomatoes suit a batch in which you plan to break down the tomatoes yourself. Check the exact product’s salt per 100g and allow for its whole-tomato texture.
Questions about batch cooking
Does “no added salt” guarantee the lowest salt figure?
No. The phrase describes whether salt was added, not a guaranteed salt value for the finished tomatoes. Compare salt per 100g on the nutrition panels of the exact tins you are considering.
How do I work out the salt from a 400g tin?
If the label gives salt per 100g for the tomatoes as used, multiply that figure by four. A tin listing 0.01g per 100g would contribute 0.04g from 400g of tomatoes; this does not include stock, sauces or seasoning added to the batch.
Should I use chopped or finely chopped tomatoes for sauce?
Choose chopped tomatoes if you want visible pieces, or a finer format if you prefer the tomato to integrate more closely into the sauce. Compare each product’s salt label separately: texture does not establish its salt content.
What should I do with tomatoes left in an opened tin?
Follow that product’s storage instruction. Marks & Spencer says to transfer its Chopped Italian Tomatoes to a non-metallic container, refrigerate and eat within 3 days; its organic version specifies 2 days. Sainsbury’s gives a 2-day instruction for its cited 227g chopped tomatoes.