Well be the first to admit that this drink is labor-intensive but its worth it All that frothing and paddling, followed by a twenty-second rest, causes the drinks foam to rise up in an impressive column, like a fluffy thunderhead of bourbon and cream. Plus, its delicious The catch with this drink is that it must be made in a small, narrow collins glass a larger glass is too roomy for the foam to shoot up past the edge of the glass.