Step 1

Using a mandolin, slice onion on the thinnest setting.  Slice jalapenos, thicker, about the width of half a pencil.

Step 2

Stuff onions, jalapenos, and the clove of garlic into a small jar; you want it to be as packed as possible.

Step 3

Combine vinegar and sugar, stir to dissolve sugar, and pour into container.

Step 4

Leave in the refrigerator for 5 days.  Shake a flip jar once a day.  It will remain fresh for a month.