In a medium bowl, combine 200 grams orange juice, 2.5 grams Versa-Whip (available online), 1/2 gram xanthan gum (also available online). Use immersion blender with whisk attachment to whip juice into foam.
In chilled cocktail shaker or pint glass, stir together Scotch, vermouth, bitters, and ice until well combined. Strain into chilled double old-fashioned glass and top with cherry ale and orange foam.
These ingredients are usually available online and, in most cases, you must buy in quantity. Willpowder.net is a good source.
