-Wash a quart glass mason jar with lid in hot, soapy water and rinse well.
-Combine ½ cup water with the following in a saucepan.
1.5 cups vinegar
3 TBS sea salt or kosher salt
3 TBS sugar
-Bring to a boil then cook until sugar and salt have dissolved; remove from heat and set aside.
-Slice 2 fresh onions into ¼ inch thick rings.
-Fill jar halfway with onion slices.
-Add 1 garlic scape (optional); cover with remaining onion slices, packing them with the back of a clean spoon. Leave ¾ inch of space beneath the rim.
-Pour hot liquid over onions, covering them by ¼ inch and leaving ½ inch of space beneath the rim.
-Place lid on jar and let stand until cool.
-Store in the refrigerator and serve within a week.