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In a medium saucepan, combine vinegar, water, sugar, and salt. Bring to a boil, stirring, until solids are dissolved. Remove from heat and add tarragon and shallot. Let stand 5 minutes.
Meanwhile, arrange asparagus in an even layer in a baking dish. Pour brine on top. Press paper towels against surface to submerge asparagus and let stand until cooled. Transfer asparagus and brine to a large sealed container and refrigerate for up to 3 weeks.