Canning method
Pit unpeeled apricots. Finely chop or grind apricots. Measure exactly 3 cups of prepared apricots into an 8-quart saucepan. Cut, peel and core pineapple, and finely chop. Measure exactly 2 1/2 cups of prepared pineapple into saucepan with apricots. Mix well.
Add lemon juice & water/fruit juice to desired liquid level. Add pectin and butter and stir over high heat until it reaches a full boil. Add sugar and stir thoroughly until it reaches a full rolling boil. Continue cooking for four minutes, stirring constantly to avoid scalding.
Ladle immediately into sterilized jars, filling to within 1/8-inch headspace at the top. Wipe jar rims and threads. Cover with two-piece lids. Screw bands tightly. Place jars in hot water bath and process for 10 minutes.
Processing: As published by Mrs. Wages: "hot water bath and process for 10 minutes" (boiling water bath canner) - 10 minutes.