Prepare your canner according to manufacturer's instructions. (Or fill a deep pot with water. Put a rack on the bottom so the jars do not touch the bottom of the pot. Bring water to a boil, ensuring water will cover the jars by at least 1".)
Sterlize pint jars in the oven at 275° for 20 minutes. Time it so lids and rings are in boiling water for 5 minutes and ready to come out at the time you are ready to close up your jars.
Wash peppers, trim the tops, remove seeds and membranes and cut into stips and/or chunks.
In a large pot, bring salt, vinegar, water and sugar to a boil over medium high heat.
Fill the hot jars with onions slices and pepper strips. Pour the hot brine over them leaving a ½" head space. Wipe the rims, position the lids and tighten the bands finger tight.
Process/simmer jars for 15 minutes in the water bath. Remove hot jars with tongs and allow to cool to room temperature overnight. Allow peppers to steep 3-4 weeks before using.
Peppers will keep up to a year, stored in a cook, dry place. Refrigerate once opened.
Notes
Nutrition is approximate and is based on peppers and onions in 1 pint jar.