Process cucumber chunks in a food processor until finely chopped. Put chopped cucumber and white onion in a piece of cheesecloth and twist to squeeze into a bowl as much liquid as possible from the vegetables, reserving the liquid.
Assure the food processor bowl is dry before returning cucumber and onion mixture to the food processor. Add cream cheese, dill, hot pepper sauce, green food coloring, and cayenne pepper. Process the mixture until smooth, scraping down the sides of the food processor bowl a few times to make sure everything is integrated. If too thick, add reserved liquid a teaspoon at a time.
