Combine chopped peppers, apples, cabbage and salt.
Let stand 2 hours.
Combine vinegar, sugar and mustard seed in a large sauce pot.
Cut two small slits in hot red pepper.
Add to vinegar mixture.
Bring to a boil; reduce heat.
Add drained pepper mixture and simmer about 10 minutes.
Remove hot red pepper.
Pack hot into hot jars, leaving 1/4 inch head space.
Process 10 minutes in boiling water bath.