I substituted 1/4 oz Green Chartreuse and 1/4 oz Italicus for the Yellow Chartreuse. I like the bigger herbal hit with less sweetness and a tad more citrusy than when I followed the OG with YC. There needs to be more cocktails that pair GC and Italicus, it's such a match made in heaven. See “Emerald Dream” on the Liber&Co site.