Keep the screen awake with cook mode on the Good Food app.
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Method
step 1
Beat egg whites to peaks
step 2
Put sugar, karo, water and salt in a saucepan. Mix slightly but do not stir. Cook until, when dropped in a bowl of cold water, the mixture becomes solid but not brittle. (265 degrees on a candy thermometer)
step 3
Immediately pour mixture into beaten egg whites, add vanilla (and food coloring, optional), and beat until mixture can be dropped onto wax paper with a spoon and remain solid.