Microwave lemon for 15 seconds and remove the seeds before juicing it.
Add chopped strawberries into a heatproof microwave-safe bowl.
Add lemon Juice and mix well. Microwave for 5 minutes on high power.
Now add sugar and stir well.
Microwave for a further 5-6 minutes on high power or until jam reaches setting point (check notes).
Transfer the warm jam in sterilized containers and keep it sealed. Once opened or used refrigerate it.
To check if jam has reached setting point, place a small amount of jam onto a chilled saucer. Place into freezer for 2 minutes or until jam is at room temperature. Run your finger through jam and wrinkle and if jam stays in 2 separate portions, it’s ready to be stored. If not, cook for a little longer and retest.