Old Fashioned Mustard Pickles and Cauliflower

I remember these pickles as a kid and I can't
seem to find them in the stores anywhere.
So here is my own recipe for them.

Ingredients
8 large cucumbers, sliced
2 cups fresh Cauliflower florets
4 cups sliced onion
2 tablespoons pickling salt
2 cups white sugar
2 tablespoons all-purpose flour
2 cups white vinegar
1 tablespoon ground dried turmeric
1 tablespoon dry mustard powder
1/2 teaspoon celery seed
2 quarts cold water, or as needed

Directions
Place the sliced cucumbers, cauliflower and onions
into a large bowl and sprinkle the salt over the top.
Fill the bowl with enough water to cover.
Let stand for 8 to 10 hours.
Drain and rinse the cucumbers, cauliflower
and onion with fresh water.
Sterilize 4 (1 quart) jars and lids.
In a 6 quart pot, stir together
the sugar and flour.
Whisk in the vinegar, turmeric, mustard powder
and celery seed to make a smooth paste.
Add the cucumbers and onions
and fill with enough water to cover.
Stir, and bring to a boil.
Cook until thickened,
about 10 minutes, stirring frequently.
Pour into hot sterilized jars
filling to within 1/2 inch of the top.
Seal with lids and rings.
Process for 10 minutes
in a simmering water bath.