Bloom gelatin in ice water until soft. Drain excess water and set aside. Bring milk, cream, sugar and vanilla bean to a boil. Remove from heat. Add gelatin and whisk until incorporated.
Place Shamrock Farms Sour Cream in a large mixing bowl and whisk until smooth. Slowly temper milk mixture into sour cream, a few ounces at a time, until entire mixture is smooth and combined. Add lemon or orange zest.
Pour into ceramic or aluminum ramekins and chill for 3-4 hours. When set, remove Panna Cotta from ramekins and served chilled with your choice of Shamrock Brand Raspberries, Blueberries or Strawberries.