Wash, core and chop unpeeled green tomatoes. Grind tomatoes in a food processor, food mill or the old-fashioned way in a sausage grinder. Drain through a colander lined with cheesecloth into a pan. Measure juice after draining and discard. Place tomatoes in a large enamel or stainless steel kettle; add a measurement of water equal to the amount of discarded tomato juice. Bring mixture to a boil. Remove from heat and drain mixture as above. Measure juice and discard. Return tomatoes to kettle, add water equal to amount of water discarded. Bring to a boil and repeat draining process. Return tomatoes to kettle and add amount of water equal to discarded tomato juice. Wash, core and chop apples. Add apples, raisins, vinegar, sugar, cinnamon, allspice, cloves and salt to tomato mixture. Cook until thick (1 to 1 1/2 hours), stirring frequently. Mixture will stick and burn quickly. Ladle hot mincemeat into hot sterilized jars, leaving 1" headspace. Adjust caps. Process 20 minutes in boiling water bath. Note: This mincemeat can be used as a pie filling for cakes, in cookies or eaten as you would jelly on biscuits, English muffins or toast. It also makes a great topping for ice cream. One quart of mincemeat is sufficient for a 9-inch pastry shell.