Pear Jam

Mix pears, lemon juice, fruit pectin, cinnamon, cloves, allspice, and nutmeg in a large heavy pot; bring to a boil, stirring constantly. Add sugar all at once, stirring, and bring back to a full rolling boil. Boil for 1 minute. Mix in butter to settle foam.

Sterilize the jars and lids in boiling water for at least 5 minutes. Pack the pear jam into the hot, sterilized jars, filling the jars to within 1/4 inch of the top. Run a knife or a thin spatula around the insides of the jars after they have been filled to remove any air bubbles. Wipe the rims of the jars with a moist paper towel to remove any food residue. Top with lids, and screw-on rings.

Place a rack in the bottom of a large stockpot and fill halfway with water. Bring to a boil and lower jars into the boiling water using a holder. Leave a 2-inch space between the jars. Pour in more boiling water if necessary to bring the water level to at least 1 inch above the tops of the jars. Bring the water to a rolling boil, cover the pot, and process for 10 minutes.

Retire os frascos da panela e coloque-os sobre uma superfície de madeira ou forrada com um pano, com alguns centímetros de distância entre eles, até esfriarem. Depois de frios, pressione a parte superior de cada tampa com o dedo, certificando-se de que a vedação esteja firme (a tampa não deve se mover para cima ou para baixo). Guarde em local fresco e escuro.