Arrowroot
Ingredients
Directions
Take some arrowroot powder and place it in a bowl.
Add a little nitric acid diluted with twice its volume of water.
Mix well for five minutes with a pestle or smooth piece of wood.
Observe the mixture: if it forms a transparent thick paste, it contains potato-starch; if it remains opaque and takes longer to thicken, it is pure.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
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