I've just looked up the recipe for Schnapps and it seems quite starightforward. A bit like the old gin thing. Equal volumes gin, fruit and sugar, shake the bottle around every so often for six months or so then strain and bottle. This works with blackberries, plums, damsons, passionfruit and raspberries. (probably others too, this is just tested to date - in the interest of science I'm thinking of testing apricots and nectarines this year)
My father in law tried chilli vodka and left the chilli's in for six months - I'm thinking I might be able to dilute it and use it as weed killer