Slice cucumbers in half or quarters, place in a colander sprinkle kosher salt over them. Set aside 20-30 minutes. Rinse salt from cucumbers.
In a small pot boil water vinegar, onion, garlic, jalapeno, kosher salt, peppercorns and mustard seeds for 5 minutes. let cool
Place cucumbers in a jar or glass dish, fresh dill sprigs. Pour mixture over cucumbers let cool to room temperature, cover and place in refrigerator for 1 week.