Wash cucumbers thoroughly, cut off blossom ends.
Sterilize jars in dishwasher or boiling water, keep hot.
Boil vinegar, water, and salt until the salt dissolves. Keep hot.
Pack hot jars with 2-3 garlic cloves, a big chunk of dill, peppercorns, and mustard seeds.
Stuff cucumbers tightly into jars, and add a grape leaf on top if using.
Pour hot brine over cucumbers, leaving 1/2 inch headspace.
Run the knife around inside to remove air bubbles.
Wipe rims completely clean with a damp cloth.
Apply lids and bands finger-tight, not cranked down.
Process in a boiling water bath for exactly 10 minutes.
Remove and set on a towel, don't touch for 12 hours.
Check seals next day - lids shouldn't move when pressed.
Store sealed jars in the pantry, and refrigerate any unsealed ones.
Wait 2-4 weeks before eating for the best flavor.