Wash the strawberries, hull and cut into pieces. Pour into a bowl, add 50 g sugar and mix well.
Peel rhubarb stems and cut into very small sections. Pour into a bowl, add 200 g sugar and mix well.
Start by heating the rhubarb in a saucepan over medium heat. When hot, simmer gently for around 10 minutes, stirring occasionally.After 10 minutes, add the strawberries and lemon juice and cook for around 20 minutes.
Check that the jam is ready by pouring a generous drop of jam onto the top of a plate and tilting it. The jam should set quickly, but not slide off the plate too much.If it doesn't, extend the cooking time by 5 minutes.
Then fill your jars with sterilized jam. Be careful not to burn yourself.Close your jars and turn them upside down until they have cooled.