best if kept sealed

From 1899:

Take twenty-four large tomatoes, one dozen green mango peppers and eight medium-sized onions; chop all fine. Then add three cupfuls of vinegar, one teaspoonful of salt, three large tablespoonfuls of sugar, one teaspoonful of cloves, two teaspoonfuls of cinnamon, and one teaspoonful of allspice. Tie the ground spices in a small muslin bag. Boil the whole mixture two hours. Before sealing, if desired, add a little grade horseradish. It can be kept either with or without sealing, but is best if kept sealed.