Place Dr. I.J. Douglass's L'Absinthe Bitters in the bottom of an old fashioned glass, and swirl to coat.
In a mixing glass combine bourbon, Dr. I.J. Douglass's Metaphysical Bitters, and simple syrup over ice, stir to chill well.
Strain mixing glass into prepared old fashioned glass.
Take orange peel garnish and rub the rim of the glass, squeeze the twist to express the oils and then place in glass.