You won't need a heavy saucepan, Mason jar, pectin, or paraffin to make these flavorful jams. Packed with chunks of fruit, they're a snap to make 0 with a little help from your microwave. Although these quick jams are made in small quantities, the mixture does bubble up in the microwave, so be sure to use a 6-cup bowl. Also, remember that doubling or tripling a microwave recipe changes the cooking time significantly. Once you've whipped up some jam, transfer it to a covered small container.. Refrigerated, it will keep for several weeks.