If making Grasshopper Pie, can I use creme de cassis in place of creme de menthe? Obviously cassis will give a different flavour but presumably has the same effect as creme de menthe.
Nigella's Grasshopper Pie (from KITCHEN) is a tart based on the grasshopper cocktail that is made with cream, minty creme de menthe and white creme de cacao, a chocolate liqueur. The filling of the pie includes melted marshmallows, as this gives a light, moussey texture.
Creme de cassis is made with blackcurrants and as chocolate and blackcurrants can be paired together then this combination may work, though it is very much a matter of personal taste. Or you could just use all creme de cassis. We would strongly suggest that you taste a little of the two liqueurs together first (or the cassis on its own), with an equal quantity of cream, to see if it is something you would really like. You may also need to add a couple of drops of purple or lavender food colouring to the mixture to give a slightly stronger colour, though go carefully and add only a drop at a time. Unfortunately as we have not tried this combination we are unable to guarantee the results, but would suggest trying My Brandy Alexander Pie, which is a brandy-based version of the Grasshopper Pie.