Wholefood Earth Citric Acid, 2 kg

Food-grade anhydrous citric acid - the same sourness that's in lemons, as a dry powder you can measure. A quarter teaspoon does the job of a tablespoon of lemon juice without thinning whatever you're making. For jam and marmalade it does two jobs: sharpens the flavour and helps a set. That matters most with low-acid fruit - pears, figs, or very sweet strawberries. Bath bombs are one part citric acid to two parts bicarbonate of soda. At 2kg you can make them in batches instead of one at a time. Descales a kettle or coffee machine without leaving a vinegar smell behind. Roughly two tablespoons in a litre of hot water, leave it to work, then rinse properly. One ingredient and nothing else. Vegan and non-GMO, from China. Packed in a facility that also handles nuts, peanuts, sesame, mustard, celery, soya and gluten.