Prepare the cucumbers: Slice the cucumbers into spears or rounds, depending on your preference. Place them in a clean, sterilized jar.
Make the brine: In a small saucepan, combine the vinegar, water, sugar, and salt. Heat over medium heat, stirring until the sugar and salt dissolve completely.
Add the spices: Once the brine is heated, add the garlic, onion, chili peppers, mustard seeds, coriander seeds, peppercorns, bay leaf, and crushed red pepper flakes to the jar with the cucumbers.
Pour the brine: Pour the hot brine over the cucumbers, ensuring that all the vegetables are submerged. Add a few sprigs of fresh dill on top.
Seal the jar: Close the jar tightly and let it cool to room temperature. Once cool, refrigerate the pickles for at least 24 hours before eating for the best flavor. For extra flavor, let them sit for 3-4 days!
Serve: Enjoy your spicy pickles as a snack, in sandwiches, burgers, or alongside any meal!