1 1/2 oz of absinthe
1 oz of simple syrup
1/2 oz of St Germain (or Elderflower Cordial)
3 dash of Peychaud's Bitters
Combine absinthe, syrup, and St. Germain in mixing glass with ice and stir. Strain over large ice chunk in an Old-fashioned glass. Float the bitters on top.