
Lychee liqueur is a sweetened liqueur made by infusing a neutral spirit with lychee fruit, ranging from clear to pale pink.
Sweet, floral and pale — three things, and most bottles nearby give two. If the lychee itself is the point of the recipe, there is no swap.
A tropical liqueur with rose water
Without the bottle, a drop of rose water over a tropical liqueur puts back the floral half that goes missing.
Sweetness and weight match, the note is rounder, and none of the rose survives; one for one by volume; the drink turns simpler.
The rose note that makes lychee lychee is the most fugitive thing in this entire category. Buy small bottles, keep them cold, and accept that an old one is a sweet floral liqueur rather than specifically a lychee one.