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What's the purpose of egg white in this sherbet recipe?

kitchengardengal Apr 29, 2013 10:56 AM

I've been making a buttermilk sherbet for decades from a recipe an old friend gave me:

2 cups buttermilk
1/2 cup sugar
8 oz crushed pineapple with juice
1 tsp vanilla
Dash salt
Freeze in tray till mushy.
Beat 1 egg white till stiff, add 1/4 cup sugar, and fold into stirred pineapple mixture. Return to freezer. Set out about 10 minutes before serving.

We make it in our ice cream maker, instead of the freezer tray method. When I make it, I beat the egg white till it's stiff, as the recipe says, add the sugar and stir it in. When Mr. Kitchen makes it, he whips the whites till they're kind of foamy, adds the sugar and stirs that in. It goes in the bowl as soon as the other ingredients are mixed together, then into the machine.

So does the egg white serve any function since we're not doing the still-freezing method? I feel like it must add body, so the stiff whipping helps. Mr. says the machine stirs air into it anyway, so it doesn't need whipping so much.
I guess this is a physics question, more than a flavor question, really. But I also think that it would give a bit of meringue flavor to it, and I love meringue.

  1. g
    GH1618 Apr 29, 2013 11:11 AM

    It's a stabilizer. The long albumen molecules help hold things together.

    3 Replies
    1. re: GH1618
      kitchengardengal Apr 30, 2013 04:27 AM

      Does beating or not make any difference, then?

      1. re: kitchengardengal
        GH1618 Apr 30, 2013 09:05 AM

        According to Harold McGee, "when air is incorporated into egg whites, the normally compact proteins unfold, partly coagulate, and so form a semisolid network."

        1. re: GH1618
          kitchengardengal May 2, 2013 01:51 PM

          Ok, then it does sound like beating the egg whites stiff will make a better texture. Thanks.

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