1. Heat oven to 350 degrees. Put berries and sugar in two ovenproof bowls or pie plates. Place in oven and bake for 25 minutes. Sterilize one-pint canning jar and lid in boiling water for several minutes.
2. Remove bowls from oven, carefully add sugar to raspberries, and stir. Mixture will become a molten jam. Pour into sterilized jar, close with lid, let cool. Store refrigerated for up to two weeks.