Originally found on Joyofbaking
225 g (2 cups) frozen raspberries
50 g (1/4 cup) sugar
few drops of lemon juice
Place the sugar and frozen berries in a heavy bottomed pot and set burner on medium. Keep on a low boil for a few minutes, mixing occasionally. Bring it down to a simmer. Add the lemon juice and mix. Let it simmer for a while, stirring occasionally until it thickens and most of the liquid is evaporated (usually takes me about 15 minutes or more) Put in container and let cool on counter. Keep refrigerated.