Discard the green top of strawberry and roughly chopped them up.

Add strawberry and raspberry in a saucepan, add sugar and bring it up to boil with medium low heat. Keep stirring at all time.

Once they become thicken and sauce like, use the mash potato mashing to mash them up. Keep stirring it on a gently heat for another 30-45 min.

Add some lime or lemon juice and stir well for another 20 min until the texture become like jam. Add a knob of butter and stir well again for another 10 min.

Store in a clean jar and keep it in the fridge.