Simple Green Tomato Relish

Ingredients

• 4 quarts chopped, peeled, cored green tomatoes (about 32 medium)
• 2 quarts chopped cabbage (about 1 large head)
• 2 cups chopped sweet green peppers (about 4 small)
• 1 cup chopped onion (about 1 medium)
• 1/2 cup salt
• 1 1/2 cup brown sugar
• 2 tablespoons mustard seed
• 1 tablesppon celery seed
• 1 tablespoon prepared horseradish
• 4 1/2 cups vinegar