To prevent egg yolk from curdling in soup, maintain the temperature below 180°F and adjust the ratio of egg yolk to cream.
To prevent egg yolk from curdling when adding it to soup, maintaining the temperature below 180°F is crucial. If the soup or sauce is heated above this temperature, the proteins in the egg yolks can coagulate and lead to curdling. Increasing the ratio of egg yolk to cream, or any other fat content, can also help stabilize the mixture and prevent curdling.
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