How do you use a mixing glass? We think that the mixing glass is a must have accessory for your bar. Of course you can use any old jug or glass but why not use one made for the purpose. It’s the perfect vessel for muddling your moscow mule, stirring your martini or vigorously mixing your side car. Just stick in the ice, and then load it up with your cocktail ingredients and go for it. Its akin to the shaker but a far more gentle way of mixing. It also looks more stylish than a normal jug!