01 -
Wash a 1-quart jar and lid in hot soapy water. Rinse well and let air dry while you prep the cucumbers.
02 -
Trim a thin slice from both ends of each cucumber. Cut into spears or 1/4-inch coins, keeping the pieces close in size.
03 -
Combine vinegar, cool water, kosher salt, and sugar in a covered jar or measuring cup. Shake or whisk until the salt mostly dissolves.
04 -
Place dill, garlic, mustard seeds, peppercorns, and red pepper flakes in the clean jar. Pack in the cucumbers snugly without crushing them.
05 -
Pour the brine over the cucumbers until fully covered. Tap the jar gently on the counter to release air bubbles, then add a little more brine if needed.
06 -
Seal the jar and refrigerate for at least 6 hours. For fuller dill pickle flavor, chill 24 hours before serving. Keep refrigerated and use within about 3 weeks.