To quote Edith Giffard, from the family company which makes this liqueur, it's "a subtle blend of an infusion of fresh pineapples ripened under the Caribbean...
I wonder if the bottle I had went stale or something, I don't think 20 percent abv is enough to keep fresh forever, like the banana for example is 24 and tastes fine to me.
That is very sage advice. The trouble is you'd just fill your fridge with half bottles. I lost a half bottle of Beesou which saddened me, it sat on the bar shelf for a couple of months inbetween uses and had gone dark orange and bitty. Shame.