Place all ingredients, except endive and garnish, in a bowl and mix to combine. Cut out the core from each Belgian endive and separate into individual leaves. Spoon about 2 teaspoons of the shrimp mixture into each endive leaf and set on a platter. (You may not need all the leaves; save any leftover ones and use in a salad.) Cover and refrigerate the endive until needed. When ready to serve, garnish each with a dill sprig and enjoy.