Custard vs. Ice Cream: What's the Difference?
| Custard | Ice Cream | |
|---|---|---|
| Egg yolks | Required, usually 6-10 yolks per quart of base | None, or just 1-2 yolks in some Philadelphia-style recipes |
| Legal minimum (US) | At least 1.4% egg yolk solids by weight to be called frozen custard | At least 10% milkfat, no egg yolk requirement |
| Base preparation | Cooked on the stovetop into a stirred custard, then chilled | Often no-cook, just whisked and chilled (Philadelphia-style) |
| Texture | Dense, silky, almost chewy from the egg proteins | Lighter, more airy, sometimes icier without added egg |
| Overrun (air churned in) | Low, typically under 20% | Higher, commonly 25-50% for commercial pints |
| Serving temperature | Often served soft, straight from the machine, like at Culver's or Shake Shack | Usually hardened in a freezer before serving |
Verdict
Choose custard when you want a denser, richer dessert with a distinct egg flavor and almost pudding-like mouthfeel, especially served soft. Choose ice cream when you want a lighter, more classic scoop that leans on cream and sugar rather than eggs for its texture.
Custard
Frozen custard starts with a cooked base of milk, cream, sugar, and a heavy dose of egg yolks, tempered slowly over heat until it thickens like a stirred custard or crème anglaise. The egg proteins coat fat and water molecules, which is why custard churns into something denser and chewier than ice cream even before you consider overrun. Commercial frozen custard machines also churn in very little air and dispense it soft, which is why Midwest stands like Culver's serve it straight from the spigot rather than from a hardened tub.
Ice Cream
Ice cream covers a wider range, from egg-free Philadelphia-style bases that are just cream, milk, and sugar, to French-style recipes that use a handful of yolks for extra body without crossing into custard territory. Because there's less or no egg to bind fat and water, commercial ice cream relies more on stabilizers and higher air incorporation (overrun) to get a smooth, scoopable texture. That extra air is also why a pint of ice cream can weigh noticeably less than a pint of custard.
FAQ
Is frozen custard just ice cream with eggs?
Essentially yes, but the egg yolk content is regulated: US standards require at least 1.4% egg yolk solids by weight for a product to be legally labeled frozen custard, while plain ice cream has no such requirement.
Why does custard taste richer than ice cream even with similar cream content?
The egg yolks in custard contain lecithin, an emulsifier that binds fat and water more tightly, which concentrates flavor and creates a denser, silkier mouthfeel than an egg-free ice cream base with the same amount of cream.
Can I turn a regular ice cream recipe into a custard base?
Yes, whisk 6-8 egg yolks per quart of dairy into the mixture, then cook it gently over low heat to about 170-175°F until it coats the back of a spoon, rather than skipping straight to chilling and churning.
Why is frozen custard often served soft instead of hard-scooped?
Frozen custard machines churn in less air (low overrun) and are designed to dispense continuously at a soft-serve consistency around 18-20°F, whereas scooped ice cream is typically hardened further in a deep freezer to about 0°F before serving.