According to MasterClass.com, muddling is u0022u003cstrongu003ea method of lightly mashing fruit, herbs, and spices for cocktailsu003c/strongu003e. A cocktail muddler is a tool like a pestle that releases the essence from fresh ingredients, adding dimension to your drinks and infusing them with the right balance of flavorsu0022. To use this method, simply add all fresh ingredients to your cocktail shaker and u0022muddleu0022 or mash them together with a muddler or a wooden spoon.