* Fresh red sweet pepper should be finely chopped. ~------------------------------------------------------------------------Wash and core the tomatoes; peel the onions. Slice the tomatoes and onions thinly, mix with the salt and let stand overnight. In the morning drain thoroughly. Put the tomatoes and onions in a large kettle and add the lemon slices, pepper, sugar, vinegar, and the spices and mustard tied in a bag. Bring to a boil and cook for about 30 minutes or until slightly thickened, stirring occasionally. Discard the spice bag and turn the relish into hot jars. Seal at once. Makes 4 litre .