A raising agent used in cakes, biscuits and breads. Commercial baking powder contains bicarbonate of soda and tartaric acid (with a dried starch or flour to absorb any moisture during storage). When these chemicals become moist and warm they react and give off carbon dioxide, which causes foods to rise.
Bicarbonate of soda has a limited shelf life so check the sell-by date when using it; otherwise your cakes might literally be a flop!
You can make your own baking powder by combining 15ml/1tbsp bicarbonate of soda with 30ml/2tbsp cream of tartar. Measure carefully as too much or too little can upset a recipe’s balance.
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