Which freeze-dried purple sweet potato format fits your bakery, dessert, cereal or snack line?
Pick the format your customer will see. 5–6 mm dice for instant porridge, cereal and toppings; 8–10 mm dice where a visible purple piece is the point, in desserts and ice cream; granules for purple flecks in granola, bars and bread; slices and sticks for an oil-free crisp snack; powder wherever the root disappears into a dough, a paste or a colour. The right cut gives the right bite, and it also sets your freight: the same 20ft container carries 3.85 t of slices, 5.5 t of dice or up to 11 t of powder.
Every format comes from the same roots: peeled purple sweet potato, steamed through and freeze-dried to ≤5% moisture and Aw ≤0.30, with nothing added. What changes from one format to the next is the size, the rehydration time and the kilos per carton. Full specifications are on freeze-dried purple sweet potato and freeze-dried purple sweet potato powder.
Which cut goes into which product?
| Format | Size | Best for | In hot liquid (85–95 °C) | Carton (58 × 28 × 34 cm) | Per 20ft |
|---|---|---|---|---|---|
| Small dice | 5 × 5 mm | Instant porridge and congee, cup soups, cereal, drink toppings | Soft in 1–2 min, fully rehydrated in 2–3 min | ≈10 kg | ≈5.5 t |
| Large dice | 8 × 8, 10 × 10 mm | Ice cream, yogurt, desserts, visible pieces in fillings and bakery | 3–5 min | ≈10 kg | ≈5.5 t |
| Granules | 1–4 mm | Granola, bars, bread and muffin flecks, dry mixes | Fastest of the pieces; softens in moist doughs and batters | ≈10 kg | ≈5.5 t |
| Slices | 3–5 mm thick, Ø 25–45 mm | Oil-free crisp snack packs, gift lines, garnish | Eaten dry | ≈7 kg | ≈3.85 t |
| Sticks | 6 × 6 × 40 mm | Oil-free snack, plain or seasoned | Eaten dry | ≈7 kg | ≈3.85 t |
| Powder | 80–100 mesh | Bread, buns, cakes, mochi, noodles, fillings, ice cream base, colour | Disperses at once | 15–20 kg | 8.25–11 t |
Two rules of thumb settle most choices. If the customer should see and bite a purple piece, buy dice or granules. If the customer should see a purple dough, cream or filling, buy powder or broken dice: they cost less to ship per kilo and save your line a milling or mashing step.
How does it work in bread, buns, cakes and mochi?
Powder carries the colour into the dough; dice and granules add visible pieces. A typical starting point is 5–10% powder on flour weight for bread, steamed buns, cakes, mochi, noodles and dumpling dough. The powder is already cooked, so it needs no pre-cooking: sift it with the flour, and add a little extra water, because the fibre and gelatinised starch take some up.
Watch the leavening. Anthocyanins turn blue-grey to green in alkaline doughs, so a cake raised with baking soda bakes up a grey-green crumb. Raise it with baking powder or yeast, or balance the soda with a little citric acid, cream of tartar, lemon juice or buttermilk, and the crumb stays violet. Yeast-raised bread and steamed buns usually hold the colour without changes. Shade by pH and the label wording for a natural colour are in purple sweet potato powder as a natural colorant.
For visible pieces in a loaf or muffin, fold in granules or 5 mm dice. At Aw ≤0.30 the pieces act like a sponge: dropped dry into the mixer, they pull water out of the gluten network, and the dough tightens and the crumb bakes dry and crumbly. Two fixes work on the line. Raise the water or milk in the recipe by 5–10%, or soak the dice in warm water at 1:1 for 1–2 minutes until the surface is just moist and add them at the end of mixing.
Mochi and steamed buns are where purple sweet potato earns its place on the shelf: a violet wrapper from powder in the dough, or a smooth purple filling from the paste below, with no colourant on the label.
How do you make a smooth filling or paste?
Start from powder or broken dice. Whisk 1 part powder into 1.5–2 parts hot water or milk and blend: it turns into a smooth paste at once, with no cooking step and no fibrous strands. 1 kg of powder makes about 2.5–3 kg of paste before sugar or fat, which is the number to use in your filling cost per tray.
Broken dice work too: soak them in hot water for a few minutes until soft, then mash or blend. They give a slightly more rustic texture and cost less to ship than whole dice. Whole 10 mm dice are the expensive way to make a paste, because you are paying for shape and freight you will blend away.
For a filling that holds in a baked bun or a mooncake-style pastry, cook the paste down with sugar and a little fat to the firmness your line needs, the way a sweet potato or taro paste is made. Add any acid ingredient late and in small amounts, because it shifts the colour toward magenta.
What happens in ice cream and yogurt?
Powder at 4–8% of the mix gives a violet ice cream base with a mild, nutty sweet-potato taste. In yogurt and fruit-based desserts the acid pulls the colour toward magenta-pink, which reads well as a “purple berry” tone and needs no correction unless your brief says violet.
Dice behave differently in frozen and wet products. Folded dry into ice cream, they take up water from the mix slowly and evenly at −18 °C, and after 24–48 hours in the freezer they turn soft and lightly chewy, close to a mochi bite. They do not freeze into icy lumps the way fresh fruit or root pieces do, which makes them an easy inclusion for gelato and pint lines. For a crisp inclusion, the usual route is a fat- or chocolate-coated piece, or the dice as a topping added at serving. In a yogurt cup with a separate topping compartment, 5–8 mm dice stay crisp until the consumer mixes them in.
Do the pieces stay crisp in cereal, granola and bars?
Yes, because the water activity matches. At Aw ≤0.30 the dice sit at the same dryness as the flakes, oats and nuts around them, so moisture does not move from one to the other and nothing goes soft in the box. Pieces with a higher water activity, such as soft-dried or infused fruit, pull the cereal toward staleness or turn hard themselves.
For visible purple flecks, use 5–8 mm dice or granules. In bars, granules spread colour evenly and bind well with syrup. In instant porridge and congee cups, 5 × 5 mm dice soften in 1–2 minutes in near-boiling water, inside the time a consumer waits for the cup. Sweet potato starch with 7–11 g of fibre per 100 g releases energy more slowly than refined flour or sugar, a useful line for breakfast cereal and bars built around sustained energy.
How do the snack formats work?
Slices and sticks eat crisp and porous straight from the bag, with no oil, and melt in the mouth after the first crunch. They suit oil-free snack packs and gift lines next to fried chips. Plain is one ingredient on the pack; seasoned versions with your own dry seasoning (sea salt, chilli-lime and similar) are available as ODM from 500 kg per SKU.
Retail packs come in 30 g, 50 g, 100 g and 500 g aluminium-foil zip pouches or custom sizes, with digital print from 3,000–5,000 pouches per SKU and rotogravure from 500 kg per SKU. Keep slice cartons free of heavy goods in your warehouse, since a whole slice is the format most likely to break. Pet treat makers use the same dice and granules; what to specify for pet food is in freeze-dried sweet potato for pet food.
How much does the format change your freight per kilo?
More than most buyers expect. A carton holds about 10 kg of dice or granules, about 7 kg of slices or sticks, and 15–20 kg of powder, so the same container carries very different tonnages.
Freight per kg = container freight ÷ net load
As a hypothetical freight figure for the arithmetic only, take USD 3,000 for a 20ft:
| Format | Net load per 20ft | Freight per kg |
|---|---|---|
| Slices or sticks | ≈3,850 kg | ≈USD 0.78 |
| Dice or granules | ≈5,500 kg | ≈USD 0.55 |
| Powder | 8,250–11,000 kg | ≈USD 0.27–0.36 |
Dice load about 43% more kilos than slices and cut sea freight per kilo by roughly 30%; powder at 20 kg a carton loads about 2.9 times the kilos of slices, roughly 65% less freight per kilo. If the root ends up milled, mashed or blended, shipping it whole costs you freight for air between the pieces. Mixing formats, or other FruitBuys products, in one full container cuts logistics cost per kilo by about 15–20% against LCL.
How do you pilot a format before the first container?
Order samples of two or three formats at once, so the comparison runs in the same week. Samples are prepared in 3–5 working days, and each comes in two sealed foil pouches: one for your trials, one kept sealed for your lab.
- Run the product in your real process: your dough, your mix, your hot-water time, your oven.
- Check bite and colour at the end of the process, not at the start. A dice that looks right dry may be too firm after a 2-minute cup soak, or a crumb may shift colour in the oven.
- Hold one finished pack for two weeks to see how the pieces and colour behave in storage.
- Approve the pre-shipment sample in writing. It becomes the reference for size, colour and texture on every lot.
If you need a smooth, even filling or colour, specify powder or broken dice: same roots, lower cost per usable kilo. If you need clear purple flecks in cereal, 5–8 mm dice. And if your brief calls for a golden piece next to the purple, the same cuts exist in freeze-dried yellow sweet potato. For lattes, milk tea and smoothies, dosing and dispersion are covered in purple sweet potato latte powder.
REQUEST SAMPLE → Tell us your product and line, and we send the two or three formats worth testing, with specifications.
FAQ
How long does freeze-dried purple sweet potato take to rehydrate?
In water at 85–95 °C, 5 mm dice soften in 1–2 minutes and fully rehydrate in 2–3 minutes; 8–10 mm dice take 3–5 minutes. Powder disperses at once.
How much purple sweet potato powder do I use in bread?
A typical starting point is 5–10% of flour weight. Use baking powder or yeast rather than baking soda to keep the crumb violet.
Why did my purple cake turn green?
Baking soda makes the batter alkaline, and the anthocyanins turn blue-grey to green. Switch to baking powder, or balance the soda with a little acid.
Can I make purple sweet potato paste from the powder?
Yes. Blend 1 part powder with 1.5–2 parts hot water or milk. One kilo of powder makes about 2.5–3 kg of paste before sugar or fat.
Will the dice stay crunchy in ice cream?
Folded in dry, they turn soft and lightly chewy after 24–48 hours at −18 °C. For crunch, use coated pieces or add the dice as a topping.
Which format is cheapest to ship?
Powder, then dice and granules. Slices and sticks carry the least weight per carton and the highest freight per kilo.
Do you make seasoned purple sweet potato snacks?
Yes, oil-free sticks or slices with your own dry seasoning as ODM, from 500 kg per SKU.
