Makes 4-6 jars
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  1. Place the strawberries in a large saucepan and use a potato masher to crush them.
  2. Add the water, sugar and lemon zest. Allow the sugar to dissolve over a medium heat, then quickly bring to a boil for five minutes. Clip a sugar thermometer to the side of the pot; the jam is set when it reaches 105 ̊C. If you don’t have a thermometer, you can check if the jam is set by the wrinkly test (see box below).
  3. Once set, allow the jam to sit in the pot for 15 minutes before pouring into sterilised jars.
  4. Top each jar with a circle of wax paper and seal with a lid.