My Pandemic Porch Cocktail for National Milk Chocolate, July 28, day was a sour for two.   Chocolate Lavender Sour   2 oz whiskey 3/4 oz creme de cacao 1/2 oz lavender simple syrup 1/2 oz lemon juice lemon peel lavender sprig   In a shaker, combine whiskey, syrup, liqueur, and lemon juice . Shake…