To ensure food safety, sterilize the jars and lids by simmering them in water for 5 minutes. Let them cool to room temperature before filling.
Trim off the woody ends of the asparagus and cut spears into lengths that will fit into the jars. Place spears in a strainer, wash well and drain. Trim onions. Combine all ingredients in air-tight containers. Refrigerate up to 4 weeks.
Created by the chefs at Mayo Clinic's Dan Abraham Healthy Living Center.
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