(Yields 1, two-quart jar)
Fill a two-quart jar or container loosely with sliced cucumbers and onions. (Choose ratio of fruits to onions based on preference.) Fill half way with water and half with white vinegar. Add one teaspoon of peppercorns and one cup of sugar. Seal with lid and shake to combine.
Place in refrigerator overnight and taste the next morning: If not sweet enough, add more sugar. (Note: small cukes are sweeter than large ones, so you might not need to add sugar.) When they get too soft (typically one week), throw that batch away. If the brine still tastes good, add more sliced cucumbers and onion and refrigerate again.