Raspberry Jam

• 500 g (1 lb 2 oz) fresh or frozen raspberries

Place the raspberries and sugar in a heavy-based saucepan over medium heat. I prefer a cast-iron pan as it keeps the heat and cooks the jam more quickly and evenly. Mash the fruit with a fork.

Heat the mixture, stirring frequently with a wooden spoon or heat-resistant spatula. Bring to the boil then place a sugar or digital thermometer in the pan. Continue to cook and stir, being carefu