Cut peppers into strip and quarter the onions. Put vegetables through the coarse blade of a food grinder or chop in a food processor. Put vegetables into a heavy kettle and pour boiling water over them to cover. Let stand 10 minutes, then drain. Add the vinegar, sugar and salt to the vegetables. Mix well. Bring to a boil and simmer for 20 minutes. Pour into clean jars while hot and seal.
Makes 10 Pints.