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maureen_me

Speaking of cornstarch, why is this happening?

17 years ago

I just got done mixing up a batch of chocolate gelato from this recipe I found on Epicurious:

Ingredients

* 3 cups whole milk

* 1/4 cup sugar

* 3 tablespoons cornstarch

* Scant 1/4 teaspoon salt

* 7 oz fine-quality bittersweet chocolate (not unsweetened), finely chopped


Preparation

Bring 2 1/4 cups milk just to a boil in a 4-quart heavy saucepan over moderate heat. While milk is heating, whisk together sugar, cornstarch, salt, and 1/4 cup (cold) milk in a bowl until smooth, then whisk into boiling milk and bring to a boil over moderate heat, whisking. Boil, whisking frequently, 3 minutes (mixture will be very thick). Remove from heat.

Bring remaining 1/2 cup (cold) milk just to a boil in a 1-quart heavy saucepan over moderate heat. Pour hot milk over chocolate in a bowl and let stand until chocolate is melted, about 1 minute, then whisk until smooth. Stir into cornstarch-milk mixture and force through a fine-mesh sieve into a bowl. Cool slightly, stirring frequently to prevent a skin from forming, then cover surface with wax paper and chill until cold, at least 1 1/2 hours.

Freeze mixture in ice cream maker, then transfer to an airtight container and freeze until hardened, about 3 hours. Let soften 5 minutes before serving.

For milk I used Parmalat, because I had a box that needed to be used, and I thought the slightly funny taste wouldn't be noticeable under all that chocolate. And I didn't have quite enough bittersweet, so I supplemented with semisweet chocolate. Nothing that would have any effect on results.

I followed the recipe to the letter. It was very thick as I strained it. Then I brought the bowl into my office with me so I could stir it occasionally, per the directions, before I chilled it. And I just noticed that the mixture has gone all liquidy again. Is there any reason for that to happen? Anything I've ever made with cornstarch gets thicker as it cools, not the reverse. Will it thicken up again upon chilling, or did I just waste a whole lot of chocolate?

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