Grind together pears, onion, pickles, and peppers in a large mixing bowl, using coarse blade of a food grinder. Add salt, stirring well. Cover and let stand at room temperature 1 hour. Rinse and drain. Set aside.
Combine sugar, cornstarch, mustard, and turmeric in a stainless steel stockpot; stir well. Add vinegar, stirring to make a paste. Stir in reserved ground vegetables. Bring to a rolling boil. Reduce heat to medium; cook, uncovered, 50 minutes or until vegetables are tender and mixture thickens; stir frequently.
Quickly ladle relish into hot sterilized jars, leaving 1/2-inch head space. Remove air bubbles. Cover with metal lids, and screw bands tight. Process relish in boiling-water bath 15 minutes. Serve with meats or vegetables.