Adapted from Tart and Sweet:

Yield: 2 pints

Approx 1 bunch of asparagus, ends trimmed and cut into pieces that will fit upright in your jars with at least 1" headspace

1 cup apple cider vinegar
1 cup rice vinegar
1 cup water
1/8 cup kosher salt

Per pint-sized jar:
1 clove garlic
1 small chili pepper (serrano preferred, but any kind will do)
1/2 tsp peppercorns
2 tsp yellow mustard seed
1/2 tsp coriander seed
1 bay leaf
1 tarragon sprig
1 dill sprig
1/4 tsp vegetable crisper granules

Bring vinegar solution to boil. Pack ingredients into hot jars. Ladle hot brine into jars, leaving 1/2" headspace.

Process 10 minutes.