In a large bowl, combine cucumbers and onion slices. Set aside.
In a medium saucepan, combine vinegar, water, sugar, mustard seed, celery seed, turmeric, and salt. Bring to a boil over medium-high heat, stirring to dissolve sugar.
Pour hot liquid over cucumbers and onions. Stir to combine.
Pack mixture into a clean, 1-quart glass jar and seal tightly. Refrigerate for at least 3 days before serving.
Interesting Facts
Bread and butter pickles are a classic American condiment.
The cucumbers used to make bread and butter pickles should be small and tender.
The pickles can be kept in the refrigerator for up to a month.