Adapted from Once Upon A Chef
No need for sterilizing of jars or special canning equipment. A couple of glass quart size jars will do the trick right in your refrigerator. After 24 hours, you have crispy delicious dill pickles.
Combine the vinegar, salt, and sugar in a small non-reactive saucepan (such as stainless steel, glass or ceramic) over high heat. Whisk until the salt and sugar are dissolved. Transfer the liquid into a bowl and whisk in the cold water. Refrigerate the brine until ready to use.
Stuff the sliced cucumbers, along with the dill sprigs, into two clean wide-mouth 1-quart glass jars. Add the coriander seeds, mustard seeds, garlic cloves, red pepper flakes, and chilled brine into the jars, dividing evenly. If necessary, add a bit of cold water to the jars until the brine completely covers the cucumbers.
Cover and refrigerate about 24 hours, then serve. Cucumbers will keep in the refrigerator for up to one month.