Add Muff Gin, Campari and Martini Riserva Speciale Rubino to a mixing glass. Add in ice and stir to slowly chill and dilute the drink. Stir until the desired dilution has been reached. Taste your drink throughout to obtain the desired taste. Pour your drink into a rocks glass with one large ice cube. One large ice cube will keep your drink nice and chilled without diluting it too quickly.