Totally agree with savonierre that MOST veggies are just label appeal and most veggies can color your soap such as pureed pumpkin and carrots to name a few. I've also used avocado in my soap and it did not produce anything beneficial.
There are few foods/ fruits that do create some added bonus such as pineapple---very exfoliating, good facial soap additive but do not over used because it can cause your batch to seize and weaken your lye. Ginger---some say it increase circulation and there is heat sensation when using hot water. Banana creates more bubbles due to the sugar content---the seeds appears speckles as it oxides over time. Papaya creats a silkness feel.