Yes, yogurt can be used instead of cream to finish gravies, offering a tangier and lighter alternative. Be mindful of temperature to prevent curdling.
Yogurt is a viable substitute for cream in gravies, especially if you're looking to reduce fat content or add a slightly tangy flavor. The key to successfully using yogurt lies in how you incorporate it. High heat can cause yogurt to curdle, resulting in an undesirable texture. To prevent this, temper the yogurt before adding it to the gravy. Tempering involves gradually increasing the yogurt's temperature by mixing a small amount of the hot gravy into the yogurt. This helps to acclimate the yogurt to the heat, reducing the risk of curdling. Once tempered, gently stir the yogurt into the gravy over low heat, ensuring it's well combined. Avoid boiling the gravy after adding the yogurt. The acidity in yogurt can also help to brighten the flavors of the gravy.
Use full-fat Greek yogurt for the best results. Its higher fat content makes it less likely to curdle compared to low-fat or non-fat varieties. Also, consider adding a teaspoon of cornstarch mixed with cold water to the yogurt before tempering; this acts as a stabilizer and further reduces the risk of curdling.