1. Can I make these ahead? Yes. Make the cucumber cups and filling separately, then fill just before serving.2. What cucumber works best? English cucumber is easiest because the skin is thin and the shape is even.3. What if I do not have a melon baller? Use a teaspoon and scoop carefully.4. What can I use instead of tuna? Canned salmon works well here too.5. How do I keep the filling from getting watery? Drain the tuna very well before mixing.6. Don't want to use alcohol? Omit the whiskey.7. StoragePrep the cucumber cups and filling ahead and store them separately in the fridge. Wrap the cucumber pieces in a damp paper towel and keep them in an airtight bag. Store the filling in a separate airtight container. Assemble just before serving.