I have not had the creme brulee, so can't comment on that.
You can order whatever you want. You don't need to have a meal. This is true of most restaurants, with some exceptions.
Exceptions include:
Any buffet like meal (mostly character meals)
Any Special Event meal (like Fantasmic seating)
Any restaurant that is only price fixed (can't think of any in DL, but WDW has some).