Heat the roasted garlic butter in a medium size oven proof skillet over medium heat. Saute the prosciutto, salami and parsley for a minute or two. Add the cooked potatoes. Saute another minute. Reduce the heat to medium-low. In a bowl, beat the eggs, water, and Locatelli cheese together. Pour the egg mixture over the sauted items in skilet. Cook over medium-low heat for 15 minutes. Remove from stove top burner and place skillet under broiler until brown on top. Slide the frittata out of the skillet and onto a serving dish. Garnish with sliced wine cured Italian black olives.