Ice cream is a sweetened frozen food that is usually made using milk and cream. You will not find this at Culver's. Instead, they have frozen custard, which is similar to ice cream, but is made with eggs instead of milk. This results in a smoother consistency and creamier texture than ice cream.
Custard has egg yolk in addition to cream and sugar. It is also more filling. This is on Wikipedia; True frozen custard is a very dense dessert. Soft serve ice creams may have an overrun as large as 100%, meaning half of the final product is composed of air. Frozen custard, when made in a proper continuous freezer will have an overrun of 15–30% depending on the machine manufacturer (an overrun percentage similar to gelato). Air is not pumped into the mix, nor is it added as an "ingredient" but gets into the frozen state by the agitation of liquid similar to whisking ameringue. The high percentage of butterfat and egg yolk gives frozen custard a thick, creamy texture and a smoother consistency than ice cream. Frozen custard can be served at −8 °C (18 °F), warmer than the −12 °C (10 °F) at which ice cream is served, in order to make a soft serve product
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