Pressure Cooker Recipes: Pressure Cooker Blueberry Freezer Jam Recipe by ePressureCooker.com. No thermometers, water baths or canning jars. You don't need to spend the better part of a day making homemade jam. Make this delicious, pectin free jam in about an hour by pressure cooking it! Makes a small enough jam batch that you have some for immediate use, and some to freeze for later.