Frozen Yogurt Recipe Development

Frozen Yogurt Categories

Mix Formulation — The Key Components

Setting the freezing point

Freezing point depression depends on total dissolved solids (sugars + salts + lactose). For typical hard-pack frozen yogurt, freezing point is around −3 to −5°C. For soft-serve, slightly higher (−2 to −3°C). This determines how much ice has frozen at the dispenser temperature (around −7 to −9°C for soft-serve).

Sucrose and dextrose differ in FP depression: dextrose depresses 1.8× more than sucrose by mass. Recipe designers blend these to achieve target body without excessive sweetness.

Stabilisers

Stabilisers do two things: increase mix viscosity (improving mouthfeel) and bind free water in the frozen product (suppressing ice crystal growth during storage). Typical stabilisers:

Most commercial frozen yogurt uses a blend — e.g. LBG + guar + carrageenan at total 0.4%. Blends give better stability than single stabilisers.

The Manufacturing Process

1. Mix preparation

Dry ingredients (SMP, sugar, stabilisers, emulsifiers) are dispersed in water (typically at 50°C). Liquid milk or cream is added. The mix is homogenised at 150–200 bar two-stage for fat emulsion and stabiliser activation.

2. Pasteurisation

HTST 80–85°C for 30 seconds — higher than for fresh milk because the yogurt fermentation step is killed by lactic acid bacteria growing in the mix. This higher heat treatment also denatures whey proteins, contributing to body and reducing syneresis. See milk pasteurisation.

3. Cooling and ageing

Cool to 4°C and hold for 4–24 hours. This allows full stabiliser hydration, partial fat crystallisation, and protein equilibration. Skip ageing and the final product texture suffers.

4. Yogurt fermentation (where used)

Two approaches:

• Pre-fermented yogurt — ferment a portion (10–30%) of the mix as standard yogurt (pH 4.4–4.6 with S. thermophilus + L. bulgaricus), then blend with the unfermented mix for the freezer
• Direct culture addition — add live culture to the cold mix just before freezing; minimal acidification in the mix

The pre-fermented approach gives sharper yogurt tartness; the direct approach gives milder, more "ice cream like" character.

5. Freezing

The mix is fed into a continuous scraped-surface freezer (SSF) at 4°C. Air is incorporated to give 30–60% overrun for soft-serve, or 80–100% for hard-pack scoop products. The mix exits at −5 to −7°C with ice crystals 20–30 µm. See ice cream structure for the foam-and-fat-network physics.

6. Hardening (for hard-pack)

Hard-pack frozen yogurt is filled into containers and hardened in a blast freezer at −30 to −40°C until core temperature reaches −18°C. This locks in the ice crystal structure created in the freezer.

7. Storage

Hard-pack stored at −25°C for shelf stability; transported at −18°C; dispensed at −14 to −16°C. Temperature stability is critical — cycling causes ice crystal growth and texture deterioration.

Positioning Levers

Frozen yogurt brand positioning is built on recipe choices:

Common Recipe Issues and Solutions

Frequently Asked Questions

How is frozen yogurt different from ice cream?

Frozen yogurt is made with cultured milk (yogurt) base and typically has lower fat content (0–3% vs 10–15% for ice cream) and characteristic tartness from yogurt culture. Both are frozen foams with similar structure, but frozen yogurt is positioned as a "healthier" alternative due to lower fat and live cultures.

What stabilisers are used in frozen yogurt?

Typical stabilisers include locust bean gum (LBG), guar gum, carrageenan, pectin, xanthan, and modified starch — usually used in blends at 0.3–0.6% total. The blend depends on price point and target texture. LBG + guar + carrageenan is a classic combination.

How much sugar does frozen yogurt contain?

Typically 10–15% sucrose equivalents, often blended with glucose syrup or dextrose for body and freezing point control. Low-calorie products use 8–12% sugar plus intense sweeteners (sucralose, stevia). Sugar content drives both sweetness and the freezing point of the final product.

Do frozen yogurt products have live cultures?

They can, but it depends on processing. If culture is added post-pasteurisation and the product is kept frozen, the culture survives in dormant state. If the mix is heated again after culture addition, or if the product warms above −15°C, the culture activity drops. "Live and active cultures" labelling typically requires verified cell counts at point of sale.

Can frozen yogurt be made without fat?

Yes — non-fat frozen yogurt is a major segment, with 0% milk fat. The fat's creaminess role is partially replaced by higher SNF (12–14%) and increased emulsifier/stabiliser. Plant-based frozen "yogurts" use coconut or oat bases. Mouth-feel is different from full-fat but acceptable to consumers seeking the health positioning.

What overrun do you target for frozen yogurt?

Soft-serve: 30–60% overrun (lower than ice cream's 90–110% to maintain "yogurt" body). Hard-pack: 50–90%. Premium products use lower overrun for denser, richer mouthfeel. Most chain frozen yogurt operates around 40–50% overrun.

What temperature is frozen yogurt dispensed at?

Soft-serve frozen yogurt is dispensed at −7 to −9°C from the freezer. Hard-pack scoop products are served at −13 to −15°C (slightly warmer than ice cream which is served at −14 to −16°C). The exact temperature depends on the freezing point of the recipe (sugar & salt content).

Further reading: John Watson publishes articles on dairy industry topics on LinkedIn. Browse all articles by John Watson on LinkedIn →

See related: Frozen Yogurt consultancy, Frozen Yogurt mix calculator, Ice cream and yogurt structure, Yogurt production, Ice cream production, Ice Cream Mix Balancer, Milk pasteurisation, Homogenisation, all dairy science information, consultancy services.