Thursday, August 7, 2008

Liquid nitrogen ice cream

I always thought that it was just a matter of time before I made liquid nitrogen ice cream. The fact that our lab recently ordered way more liquid nitrogen than we'd ever use was the only excuse I needed to make it two Thursdays ago.

Priscilla looked up the recipe online. The most attractive recipe was half-and-half, sugar, and vanilla extract. We wanted to keep it simple.

She got all the ingredients and also lent two metal mixing bowls to the project. We didn't have any dewars, but a metal mixing bowl with an asbestos glove is a fine substitute.

Jeremiah helped stir.

The nitrogen generated a lot of bubbles that wouldn't pop. I knew there would be bubbles, but it was more annoying that I thought it would be.

We stirred in some fresh strawberries near the end. It was very good. It pretty much tasted like frozen strawberries and cream.

The ice cream was a bit icier than I thought it would be. I was expecting a much smoother final product. Some of that might be because we used half-and-half rather than straight cream, but I think that it also might be a matter of technique. We'll see if we can improve on that in the future.

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