That reminded me of the raspberries I used to grow, always far too many of them, until the family was heartily sick of them. I gave them to everyone in sight. They became heartily sick of them. So I started on jam-making, using the recipe given to me by my mother-in-law. It did produce a particularly good jam which was very popular with family and friends alike.
To make 10 bs jam:
6 lbs washed rasberries
6 lbs warmed preserving sugar
Juice of 2 lemons
Place the raspberries in a pan and heat until the juices run. Simmer gently for 5 minutes.
Add the sugar to the pan and stir until completely dissolved.
Add the lemon juice.
Bring back to the boil while stirring.
Boil rapidly without stirring for exactly 3 minutes.
Pour into hot jam jars and seal immediately.
I would add "enjoy", but that goes without saying.