Salt-first biscuit bakers
If salt is your deciding factor, compare ready-to-serve custards per 100g rather than relying on the name on the front of the pack. Tesco, ASDA and M&S each list a 400g custard at 0.10g salt per 100g.
Who this is for
Recipe-following home bakers
If your biscuit recipe specifies prepared custard for a filling, drizzle or dessert component, check that you are buying ready-to-serve custard rather than powder.
Bakers who need to control the liquid
If a recipe calls for a dry custard ingredient or lets you adjust a filling’s consistency, custard powder keeps the added milk separate. Bird’s says the milk quantity can be varied during preparation.
What matters when choosing
Start with the ingredient format named in the biscuit recipe. If ready-to-serve custard fits, compare the salt figures on the same per-100g basis.
| Concern | What to check | Who this matters to |
|---|---|---|
| Salt on the label | Compare salt per 100g on current packs. The NHS classifies 0.3g or less per 100g as low in salt; that does not, by itself, substantiate a reduced-salt claim. | If salt is my main reason for choosing between suitable tins, I want their figures on the same basis. About 33% of consumers put that comparison first. |
| Ready-to-serve format | Check whether the recipe calls for prepared custard or for powder; use a tested conversion before changing formats. | When a biscuit filling calls for custard that is already prepared, I want the specified wet ingredient. About 45% of consumers prioritise that ready-to-serve fit. |
| Control of added liquid | For a recipe specifying custard powder, measure the separately added milk as directed. Bird’s says its milk quantity can be varied when preparing custard. | If I am making dough with a dry custard ingredient, I need to control how much liquid goes in. About 22% of consumers put that control first. |
Mistakes to avoid
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Reading “low salt” as “reduced salt”
These terms answer different questions. The NHS low-salt threshold concerns the amount per 100g; a reduced-salt claim requires a qualifying comparison with a similar product under the applicable nutrition-claims rules.
Compare the salt figures first. If a reduced-salt claim is essential, check the current pack or manufacturer information for the claim and its comparator.
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Swapping a tin for custard powder in biscuit dough
Ready-to-serve custard is wet, while Bird’s custard powder is prepared with separately added milk and sugar. A direct swap changes the ingredients going into the recipe.
Use the format specified by the recipe, or follow a tested conversion for that particular biscuit recipe.
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Assuming a light variant has less salt
Ambrosia lists 0.12g salt per 100g for its Light Devon Custard can and 0.11g per 100g for its standard Devon Custard can. Its lower-sugar-and-fat positioning does not describe the salt comparison.
Check the salt line for the exact variant you plan to use.
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Overlooking storage after opening
Opened-pack instructions differ. Ambrosia says to refrigerate remaining standard Devon Custard and consume it within three days; M&S specifies two days for Silky Smooth Custard.
Follow the instructions on the individual pack and choose a quantity that suits the recipe.
Brands to consider for this choice
Ambrosia
Its 400g Devon Custard cans are ready-to-serve options for recipes that specify prepared custard.
- Ambrosia lists 0.11g salt per 100g for standard Devon Custard.
- Its Light Devon Custard lists 0.12g salt per 100g; the light variant is not the lower-salt choice between those two cans.
Tesco
Tesco Ready To Serve Custard is a 400g prepared custard for recipes that call for a wet custard ingredient.
- Tesco lists 0.10g salt per 100g.
- Its ready-to-serve format is not a direct substitute for custard powder in biscuit dough.
Asda
ASDA lists both Just Essentials Custard and Creamy Custard in 400g ready-to-serve formats.
- ASDA lists 0.10g salt per 100g for Just Essentials Custard.
- Creamy Custard lists 0.11g per 100g, so check which variant the recipe will use.
M&S
Silky Smooth Custard is a 400g prepared custard made with whole milk and cream, according to M&S.
- M&S lists 0.10g salt per 100g.
- M&S instructs customers to refrigerate it after opening and eat it within two days.
Bird’s
Original Custard Powder is a dry ingredient, not a ready-to-serve tin.
- Bird’s says the milk quantity can be varied when preparing custard, which matters when a recipe calls for an adjustable consistency.
- Bird’s lists 0.15g salt per 100g when prepared with semi-skimmed milk; that is a different preparation basis from custard sold ready to serve.
Sainsbury’s
Ready To Eat Custard is listed in a 1kg format, rather than the 400g tins compared above.
- The larger format may suit a recipe requiring more prepared custard.
- Sainsbury’s lists 0.15g salt per 100g and instructs refrigeration after opening, with consumption within three days.
Ready-to-serve tins on Joybuy
These Ambrosia 400g custard cans are options for a biscuit recipe that specifically calls for ready-to-serve custard. Compare their listed salt figures and choose the exact flavour or variant the recipe requires; none is a direct powder substitution.
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Ambrosia Strawberry Flavour Devon Custard 400g
Consider this strawberry-flavoured can only where its flavour and ready-to-serve format suit the recipe. The Joybuy listing gives 0.10g salt per 100g; check the current pack for ingredients and allergens before baking for someone else.
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Ambrosia Devon Custard 400g
This standard ready-to-serve can fits a recipe that calls for prepared custard. Ambrosia lists 0.11g salt per 100g, compared with 0.10g per 100g for the Tesco, ASDA Just Essentials and M&S products discussed above.
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Ambrosia Low Fat Custard 400g
This 400g ready-to-serve can is for recipes that accept prepared custard. Its Joybuy listing gives 0.12g salt per 100g; the Low Fat name should not be read as a lower-salt claim.
Common questions
What does low salt mean on a UK food label?
The NHS classifies food containing 0.3g salt or less per 100g as low in salt. Check the current pack’s per-100g figure when comparing custards, because a product’s recipe may change.
Does a low salt figure mean a custard is reduced salt?
No. A reduced-salt claim requires a qualifying comparison with a similar product under the applicable nutrition-claims rules; a low per-100g figure alone does not establish one. If that claim matters to you, check what comparison the current pack or manufacturer makes.
Can I use tinned custard instead of custard powder in biscuit dough?
Not as a direct like-for-like swap. Ready-to-serve custard adds liquid, while a recipe using custard powder controls the other ingredients separately. Follow the specified format unless the biscuit recipe provides a tested conversion.
What if I am baking for someone with a milk allergy?
Do not assume these ready-to-serve custards are suitable. The Ambrosia, Tesco, ASDA and M&S product information identifies milk ingredients or milk allergen information; check the exact current pack’s full ingredient and allergen statements before baking.
How long can I keep custard after opening it?
Follow the particular pack’s storage instructions rather than using one period for every custard. Ambrosia specifies refrigeration and use within three days for its standard Devon Custard can, while M&S specifies two days for Silky Smooth Custard.