r

rawali's Profile

Title Last Reply

Cooking with cream--will it curdle?

"How does a high fat content permit the cook to boil a mixture of heavy cream and salty or acidic ingredients without curdling it, as when dissolving pan solids or thickening a sauce? The key seems to be the ability of the fat globule’s surface membrane to latch onto a certain amount of the major milk protein, casein, when milk is heated. If the fat globules account for 25% or more of the cream’s weight, then there’s a sufficient area of globule surface to take most of
the casein out of circulation, and no casein curds can form. At lower fat levels, there’s both a smaller globule surface area and a greater proportion of the caseincarrying water phase. Now the globule surfaces can only absorb a small fraction of the casein, and the rest bonds together and coagulates when heated. (This is why acid-curdled mascarpone cheese can be made from light cream, but not from heavy cream.)" -Harold McGee

Nov 20, 2012
rawali in Home Cooking