Easy way to get strawberry jam to set

[PLUMPUDDING]

I get a few gooseberries, about 2 oz to 2 lb of strawberries and chop the gooseberries up really small and just make the jam as usual with equal sugar to fruit. It sets every time and you can't taste the gooseberries.

[Monika]

What a good idea. I made some strawberry jam a fortnight ago and, though it appears set when you first open it, it becomes increasingly runny as the jam goes down in the jar. I did use lemon juice and sugar with pectin but it still didn't set properly, obviously. Next year I shall try the gooseberry trick, Plumpudding!