It means exactly that… we double age it. First we aged Charbay Rum for five years in stainless steel as a clear rum, then we transferred it to French oak barrels for an additional three years. Eight years of aging in total. Why? We wanted you to taste the difference that time makes.
Aging in stainless steel allows the spirit to mellow and soften, without extracting additional flavor (from a barrel, for instance). Marko likes to age spirits to show off the actual spirit, not the barrel it’s aged in.