Chop cucumbers, onion and pepper in a food processor.
Combine processed cucumber mixture in a mixing bowl, sprinkle with the salt and cover with water. Let stand for 3 hours.Drain, rinse and drain the mixture.
In a large saucepan combine vinegar, water, sugar, mustard seeds and pepper.
Bring to a boil. Add vegetables and simmer for 10-15 minutes.
Pack in a jars. Let it cool completely before store in refrigerator.