You can make your own pumpkin puree from a real pumpkin. You’ll need to remove the seeds from the pumpkin and cut it into big pieces. Then, roast the pieces on a baking sheet. Once tender, scoop the flesh away from the rind and blend it until it’s smooth. You can also use a can of sweet potato. Or any other blended winter squash puree, such as butternut squash or acorn squash.