Here is a recipe from the cookbook. This recipe came from Billy Joel whose real name is William Joseph Martin Joel. Not only is he a singer/songwriter, but he "helped design a speedboat called the Shelter Island Runabout".
Here is his recipe for Grilled Tuna and Marinated Cucumber Salad:
Preparation should begin a day ahead of time.
Billy Joel doesn't provide us with ingredient amounts, so you'll have to adjust according to your family's needs.
Marinate the tuna steaks overnight in the fridge in a mixture consisting of:
4 parts olive oil
1 party teriyaki
1 part lemon juice
Make enough to completely cover the steaks
Also prepare a day ahead of time
Peel cucumbers and slice thin. Combine them with a mixture of:
white wine vinegar (~1/4 cup for each cucumber)
coriander (1/2 tsp for each cucumber)
a dash of olive oil
Add chopped onions, if you choose
Next day -
Grill the tuna on a BBQ or open flame. Leave the tuna pink on the inside.
Break the tuna into chunks and combine with cucumber mixture. BEFORE you mix the tuna and cucumber salad, discard the liquid in the cucumber salad.