Pickled Onion

Ingredients (9)

• 1 medium onion, cut into 1/8-inch slices
• 1-1/2 teaspoons salt, divided
• 1/3 cup cider vinegar
• 1/4 cup water
• 3 tablespoons sugar
• 1 garlic clove, peeled and halved
• 1/2 teaspoon mustard seed
• 1/2 teaspoon prepared mustard
• 1/4 teaspoon celery seed