Three-Kilo Raspberry Confiture

Usually, our “small batch” of raspberry jam starts with 6½ pounds (3 kg) of fruit. It seems like a lot, but since it only makes sixteen jars, we need to make two or three batches just to get our own family through the winter. We always use a vintage copper jam pot. Copper heats up and cools down more quickly than stainless steel, which means the jam both cooks faster, ensuring brighter color and flavor, and stops cooking more quickly, preventing the jam from overcooking. Scrubbing the pot w