Bread & Butter Pickles

This recipe tastes more like a bread and butter pickle. It is different, and all who taste it love it.

4 Lbs cukes
3 med onions
3 cups sugar
3 cups cider vinegar
4 tsps salt
1 1/2 tsps Mustard seed
1/2 tsp alum
1 1/2 tsp coarse ground black pepper

If taking for pot luck put in a large container or casserole dish. If making this at home for my own use, I start with 1 1/2 cups sugar and 1 1/2 cups cider vinegar, about 1 1/2 tsp salt and just dump in some alum, mustard seed and pepper. I use about 2 large cukes.
Thanks to Sister Jensen for this recipe!