Prepare the Cucumbers: Wash the cucumbers thoroughly. Slice them into rounds, spears, or keep them whole, depending on your preference. Leave the skin on for added crunch or peel if desired.
Make the Brine: In a pot, combine the vinegar, water, salt, and sugar. Bring the mixture to a boil, stirring to dissolve the salt and sugar. Add mustard seeds, peppercorns, garlic, chili flakes, and any optional spices like fresh dill or bay leaves. Simmer for 2-3 minutes to let the flavors meld.
Pack the Jars: Place the cucumber slices or spears into sterilized jars. Pack them tightly, ensuring they are evenly arranged. Add additional herbs or spices if desired, such as dill sprigs or extra garlic.
Pour the Brine: Once the brine has cooled slightly, pour it over the cucumbers in the jars. Ensure the cucumbers are fully submerged. Use a spoon to gently press them down, releasing any trapped air. Seal the jars tightly.