Step 1: You will need
- 1/2 kg strawberries, destalked and washed
- 350 g sugar
- juice of one lemon
- 1 tbsp butter
- 1 medium saucepan
- 1 spoon
- parchment paper
- 1 elastic band
- 1 half-litre jar
Step 2: Add sugar to strawberries
Put the strawberries in the pan, sprinkle over all of the sugar and place it into the fridge overnight.
Step 3: Heat the strawberries
Place the pan on a medium heat and let the sugar to dissolve. This will take roughly 6 minutes. Do not stir at this point as not to break up the fruit.
Once dissolved bring to a boil and add the lemon juice. Stir briefly and boil rapidly for 8 minutes.
Step 4: Add butter and cool
After 8 minutes spoon in the butter and stir in. Take off the heat and allow to cool for 20 minutes.
Step 5: Transfer into jar
Spoon the strawberry jam into the jar. Cover it with a small square of parchment paper and seal tightly with an elastic band. Finally, put the jar lid back on, closing it tightly.
The strawberry jam can be kept in a cool, dry place for 2-3 weeks.