Why Do Recipes Omit Prepositions and Articles?

Chuck Steak Recipe

A “Chuck Steak” recipe from http://www.food.com.

Surely it should be “1 tablespoon of salad oil”, “In a 12-inch Dutch oven”, “skim the fat from the liquid”, …?

Except that omitting prepositions and articles in this way is the standard style for recipe writing and has been for ages.

Why?

I don’t know, and haven’t been able to find out.

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