In a large heavy saucepan, combine all but 1/2 cup of the sugar with 2 cups of water and bring to a boil over high heat. Reduce the heat to medium and simmer, without stirring, until thick and amber in color. When caramelized, remove from the heat and divide among 6 individual crème caramel cups or ramekins. Let caramel cool to room temperature.
Preheat the oven to 350 degrees F.
In a medium bowl, combine the remaining 1/2 cup sugar, milk, lemon zest, vanilla, food coloring, and eggs, and mix very well. Pour this mixture into the cups or ramekins; fill each until nearly full.
Place the creme caramel cups into a large baking dish. Make a water bath by adding water to the dish so that it comes about halfway up the sides of the cups. Bake for 45 minutes. Carefully remove from the water bath, let cool to room temperature, and then refrigerate until completely chilled before serving.
Professional Recipe: This recipe was provided by a chef, restaurant or culinary professional and makes a large quantity. The Food Network Kitchens chefs have not tested this recipe in the proportions indicated and therefore cannot make any representation as to the results.
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