Cooks comparing saturated fat
A convenient roast side may be plain vegetables or a preparation with added fats. Comparing the pack’s fat and saturates figures per 100g helps distinguish them; oil or butter added during cooking also matters.
Who is choosing these vegetables?
Cooks short on preparation time
Some frozen vegetables can be microwaved, while roast-style products may require an oven or air fryer. Choose the format that works with the appliance and serving style you have in mind.
Households checking ingredients
Prepared vegetable sides can contain milk, meat-derived fat, honey or coatings. Check the current pack when an ingredient or allergen affects what you can serve.
What should you check first?
Decide whether you want steamed vegetables or an oven-roasted side, then compare the nutrition and ingredients of products that fit that plan.
| Priority | What to check | Your needs |
|---|---|---|
| Fat and saturates | Compare both figures per 100g. Check whether each figure describes the frozen product or a product cooked by a stated method; read the traffic-light label alongside the nutrition panel. | I want to compare sides on the same basis rather than judge them by their names. In a 2024 UK food-shopping survey of 611 people by Ipsos for the Food Standards Agency, approximately 49% reported actively using traffic-light labelling when shopping for food; this was not a measure of frozen-vegetable purchases. |
| Vegetable format | Check whether the pack contains plain vegetables, a prepared roast mix or a richer side with butter or dripping. For example, Tesco Groceries lists 8.7g fat and 4.2g saturates per 100g for its Finest Roasting Root Vegetables with Beef Dripping Butter. | For a roast-style side, I would consider a prepared mix; for more control over what goes into the dish, I would start with plain frozen vegetables. |
| Cooking method | Check the specified appliance, whether to cook from frozen and any portion or spacing instructions. Allow for oil or butter added at home when considering the finished dish. | A steam-bag side works for me if vegetables need to be ready quickly; if I want oven-roasted vegetables, I need a product with directions for that method. |
| Ingredients | Read the current ingredient and allergen statements for milk, animal-derived fats, honey and coatings. A vegetable-based product is not necessarily suitable for every diet. | I need the side to suit everyone at the table, so I cannot rely on the words “roast vegetables” to tell me what else is in it. |
| Serving style | Check which vegetables are included and whether the instructions produce steamed vegetables or an oven-cooked side. Treat roast potatoes as a separate part of the meal rather than a substitute for mixed vegetables. | Peas and carrots alongside the roast would suit my meal differently from parsnips or a Mediterranean-style mix. |
What can change your choice?
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Assuming every frozen vegetable side has similar nutrition
Ingredients and fat figures can differ markedly between a vegetable mix and a prepared roast side. Waitrose & Partners lists 0.2g saturates per 100g for its Frozen Grilled Vegetable Mix; Tesco Groceries lists 4.2g per 100g for its Finest Roasting Root Vegetables with Beef Dripping Butter.
Compare the current nutrition panels on a per-100g basis and check for added oil, butter, dripping, batter or glaze.
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Overlooking how the nutrition figure was measured
A figure for vegetables cooked as instructed may not describe the dish after you add oil or butter at home. Different stated cooking bases can also make a quick comparison misleading.
Read the basis beside each nutrition figure and follow the pack directions before deciding how much, if any, extra fat to add.
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Judging dietary suitability by the vegetable name
Tesco Finest Roasting Root Vegetables with Beef Dripping Butter contains butter (milk) and beef dripping, despite being a vegetable side.
Check the current pack’s ingredients and allergen statement whenever vegetarian suitability or an ingredient restriction matters.
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Using a cooking method the pack does not specify
A steamable mix and a ready-to-roast product need not have interchangeable instructions. Crowding vegetables during oven or air-fryer cooking can also affect how evenly they cook.
Use the appliance, portion size and cooking directions stated on the pack, and check that the vegetables are cooked as instructed before serving.
Brand and retailer references
These examples show why the individual product and its preparation matter more than the name on the pack.
Birds Eye
Birds Eye describes its Country Mixed Vegetables as an accompaniment to a traditional Sunday roast.
- The listed mix contains cauliflower, carrot, peas and broccoli and can be microwaved or boiled from frozen.
- Check its current fat and saturates panel before comparing it numerically with prepared roast sides.
Tesco
Tesco’s prepared vegetable sides include both a Mediterranean-style roasting mix and a root-vegetable product with beef dripping butter.
- Tesco Groceries lists 2.3g fat and 0.3g saturates per 100g for Mediterranean Style Roasting Vegetables when cooked as instructed.
- Tesco Groceries lists 8.7g fat and 4.2g saturates per 100g for Finest Roasting Root Vegetables with Beef Dripping Butter; it also contains milk and beef dripping.
Sainsbury's
Sainsbury's Roast Potatoes are an example of a frozen roast accompaniment rather than a mixed vegetable side.
- Sainsbury's lists 4.7g fat and 1.4g saturates per 100g for the roast potatoes after cooking.
- They are potatoes with a crispy coating, so consider them separately from the vegetables served alongside the roast.
Asda
ASDA Ready to Roast Parsnips provide a traditional roast-style option with oven and air-fryer directions.
- ASDA Groceries lists 4.2g fat and 0.4g saturates per 100g when oven baked; the pack labels the product low in saturated fat.
- ASDA Honey Roasted Parsnips are a different product containing honey and listing 4.4g fat and 0.5g saturates per 100g. Check the variant rather than treating the two parsnip products as identical.
M&S
M&S lists both simple frozen vegetables and prepared vegetable sides in its frozen range.
- The range includes mixed vegetables, cauliflower, broccoli and sprouts, allowing a choice of vegetable styles for the meal.
- The M&S Mediterranean Style Roasting Vegetables product with a stated nutrition panel is chilled, not frozen. Check the particular frozen product’s own label for a comparison.
Waitrose
Waitrose offers basic frozen vegetables as well as a prepared grilled vegetable mix that can be roasted from frozen.
- Waitrose & Partners lists 1.7g fat and 0.2g saturates per 100g for Frozen Grilled Vegetable Mix.
- The grilled mix contains sunflower oil. Check its ingredients if you want vegetables without added oil.
Joybuy vegetable sides
These Birds Eye frozen mixes offer vegetables to serve alongside a Sunday roast. Steam-bag options suit a steamed side; check the pack if you specifically want vegetables for oven roasting, and compare nutrition panels before choosing for fat content.
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Birds Eye Steamfresh Family Favourite Mix, 4 steam bags, 540g
Consider this mix when a steamed vegetable side suits your roast. Check the pack’s cooking directions and nutrition panel if you are comparing it with an oven-roasted side.
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Birds Eye Fresh Garden Mix, 4 steam bags, 540g
This is another steam-bag format for a vegetable side. If roasted vegetables are the aim, check the pack for a suitable cooking method rather than assuming steam bags will brown.
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Birds Eye Peas and Sweetcorn Mixed Vegetables, 640g
Peas and sweetcorn offer a mixed vegetable side without committing to a prepared roast-style product. Check the current pack for the appliance method and cooking time you need.
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Birds Eye Steamfresh Super Sunshine Mix, 4 steam bags, 540g
Choose the steam-bag format if it fits how you plan to serve the vegetables. For a fat comparison with other sides, use the pack’s per-100g panel rather than a per-bag figure.
Common questions
Are all frozen vegetable sides low in fat?
No: plain vegetables and prepared roast sides can have different ingredients and nutrition figures. Waitrose & Partners lists 1.7g fat and 0.2g saturates per 100g for Frozen Grilled Vegetable Mix, while Tesco Groceries lists 8.7g fat and 4.2g saturates per 100g for Finest Roasting Root Vegetables with Beef Dripping Butter. Check each panel’s cooking basis before comparing them.
Should I choose plain vegetables or ready-to-roast parsnips?
Choose plain frozen vegetables if you want to decide what to add during cooking; choose ready-to-roast parsnips if that serving style matters. ASDA Groceries lists 0.4g saturates per 100g for Ready to Roast Parsnips when oven baked and labels them low in saturated fat. Follow the pack method and account for anything else you add.
Can I cook frozen roast vegetables in an air fryer?
Use an air fryer when the particular product supplies directions for it. ASDA Ready to Roast Parsnips gives guidance for a minimum 4L air fryer and a 125g portion. Check your pack’s capacity, portion and turning instructions rather than transferring those directions to another product.
How should I handle frozen vegetables before serving?
Keep them frozen and follow the individual pack’s storage, cooking and refreezing directions. Where it says to cook from frozen, use the specified method and check the food is cooked as instructed before serving.
What if someone at the table avoids milk or meat?
Read the current ingredient and allergen statements for the exact product. Tesco Finest Roasting Root Vegetables with Beef Dripping Butter contains butter (milk) and beef dripping, so a vegetable side should not be assumed suitable solely because of its name.