Yes. They will want you to pay for butler service in addition to the price of the meal. There's an old menu HERE for reference, but you can pretty much customize it with anything that they think will travel well—it's not just limited to appetizers.
To get started planning the meal, contact Private Dining at the Grand Floridian: 1-407-824-2474. To book the yacht, call 1-407-WDW-PLAY.