Sweet Pickled Cucumbers

7 long cucumbers
2 large onions
5 cups white vinegar
5 cups white sugar
1 tablespoon dry mustard seeds
2 teaspoons turmeric
1 teaspoon vegetable salt (optional)
½ cup salt
Slice cucumber and onion thinly,
sprinkle with ½ cup salt and stand
Next day, drain off liquid from onion
and cucumber and discard brine.
Place drained cucumber and onions
into saucepan and pour over vinegar and
sugar, mix and bring to boil (point of boil).
Bottle and seal whilst hot.