Wash green beans and trim ends so that they can fit into a pint-sized jar with about an inch of clearance. If the green beans are too long, just slice them in half, crosswise. Pack green beans upright into two sterilized pint-sized jars.
Combine vinegar, water, salt, sugar, and peppercorns in a small saucepan and whisk to dissolve the salt and sugar. Once the brine comes to a boil, remove it from the stove.
Slice a serrano pepper in half and add one half to each jar. Slice each garlic clove in half and divide between the jars, then add dill.
Divide brine between the two jars, leaving ½ inch of headspace. Wipe jar rims, then add lids and tighten collars. Marinate for at least 3 days to a week before enjoying.
Notes
When choosing green beans, use young, firm green beans with no bulging seeds.
Arrange the beans vertically in jars; it looks nice and prevents floating.
Make sure the vinegar you use has 5% acidity.
Use white vinegar for a sharper flavor or apple cider vinegar for a softer, fruitier tang.
Resist eating them right away! They’re best after 1 week so the flavors meld.