Wash peppers, quarter them, remove cores and seeds, trim blemishes, and slice into strips.
Boil sugar, vinegar, and water for 1 minute. Add peppers and bring to a boil.
Place 1/2 clove garlic and 1/4 teaspoon salt in each sterile half-pint jar; double for pint jars.
Add pepper strips and cover with hot vinegar mixture, leaving 1/2-inch headspace.
Process half-pints or pints 5 minutes at 0–1,000 ft, 10 minutes at 1,001–6,000 ft, or 15 minutes above 6,000 ft.