Refrigerator Cucumber Slices - cooking recipe

Ingredients

4 lbs. cucumbers (about 6 large), cut into 1/4-inch slices
3 med. onions, cut into 1/8-inch slices
3 C. sugar
3 C. vinegar
4 tsp. canning salt
1 1/2 tsp. mustard seed
1/2 tsp. alum

Preparation

In a large container combine cucumbers and onions.
In a large bowl combine remaining ingredients, stirring until sugar is dissolved.
Pour over cucumbers, mix well.