Requirements for frozen custard.
CFR · 2024-01-01 · US · Title 7
The same requirements apply as for ice cream except plain frozen custard shall have a minimum egg yolk solids content of 1.4 percent, and 1.12 percent when fruits, nuts and other such ingredients are used for flavoring.
official document · source cfr-2024 · id 7:§ 58.650